KR20150046513A - Optical sheet and liquid crystal display device comprising the same - Google Patents

Optical sheet and liquid crystal display device comprising the same Download PDF

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Publication number
KR20150046513A
KR20150046513A KR20130125828A KR20130125828A KR20150046513A KR 20150046513 A KR20150046513 A KR 20150046513A KR 20130125828 A KR20130125828 A KR 20130125828A KR 20130125828 A KR20130125828 A KR 20130125828A KR 20150046513 A KR20150046513 A KR 20150046513A
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KR
South Korea
Prior art keywords
base film
prisms
light
reflectors
inverse
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KR20130125828A
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Korean (ko)
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KR102053442B1 (en
Inventor
김영웅
김동혁
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엘지디스플레이 주식회사
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Priority to KR1020130125828A priority Critical patent/KR102053442B1/en
Publication of KR20150046513A publication Critical patent/KR20150046513A/en
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    • 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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • 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
    • G02F1/133553—Reflecting elements
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Abstract

According to the present invention, an optical sheet includes: a base film; a prism layer which is formed on the base film and includes a plurality of reverse prisms having a first refractive index; an interference prevention layer which is formed on the prism layer to cover the reverse prisms and has a second refractive index smaller than the first refractive index; and a plurality of reflectors which are formed between the base film and the reverse prisms and provide additional reflective sides joined with each reflective side of the reverse prisms.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical sheet and a liquid crystal display including the optical sheet.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an optical sheet, and more particularly to a light collecting sheet and a liquid crystal display including the light collecting sheet.

2. Description of the Related Art Recently, a display field for visually expressing various electrical signal information has been rapidly developed. Various flat panel displays (FPDs) having excellent characteristics such as thinning, light weight, and low power consumption have been developed Has been introduced to replace CRT (Cathode Ray Tube).

Examples of such flat panel display devices include a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), an electroluminescence display (ELD) Among them, the liquid crystal display device has a high contrast ratio and is excellent in moving picture display and is currently being used most actively in a display screen for a notebook, a monitor, and a TV.

In general, a liquid crystal display device classified as a light-receiving-type display device may include a backlight unit disposed below the liquid crystal panel for providing light to the liquid crystal panel, in addition to a liquid crystal panel for displaying an image. The backlight unit may include a light source for providing light to the liquid crystal panel, a light guide plate for converting the light provided from the light source into a surface light source, and an optical sheet. Here, the optical sheet may include a diffusion sheet for diffusing light, a prism sheet for condensing light, and the like. In the conventional backlight unit having the above configuration, the light emitted from the light source can be condensed by the prism sheet and then supplied to the liquid crystal panel.

FIG. 1 is a schematic view showing that light incident on a conventional prism sheet is condensed. FIG. Referring to FIG. 1, the prism sheet 20 includes a base film 21 and a plurality of reverse prisms 22. A light source 5 for generating light and a light guide plate 10 for totally reflecting the light incident from the light source 5 and supplying the light to the prism sheet 20 are positioned below the prism sheet 20. When the light is incident on the prism sheet 20 from the light guide plate 10, the incident light is reflected by the difference in refractive index between the air layer and the inverse prism 22 (the refractive index of the prism is larger than the refractive index of the air) The light is totally reflected by the refractive index difference between the inverse prism 22 and the air layer at the reflection surface of the inverse prism 22 and is condensed and emitted in the vertical direction.

Since the peaks of the inverse prism 22 are protruded toward the light guide plate 10 in this conventional prism sheet 20, the mountains of the inverse prism 22 may be rubbed against the light guide plate 10, . In order to solve the problem of breaking the inverse prism 22, a complementary prism sheet 30 having the interference prevention layer 23 as shown in FIG. 2 has been proposed.

The complementary prism sheet 30 shown in Fig. 2 includes a plurality of inverse prisms 22 formed on the base film 21 and a plurality of inverse prisms 22 formed on the inverse prisms 22, (23). The surface of the interference prevention layer 23 is parallel to the base film 21.

The refractive index of the interference prevention layer 23 is smaller than the refractive index of the inverse prisms 22 but larger than the refractive index of the air. The refraction angle θ formed by the refracted light with the normal line N on the incident surface of the inverse prism 22 is inversely proportional to the refractive index difference between the inverse prism 22 and the interference preventing layer 23. Since the refractive index of the interference prevention layer 23 is larger than that of air, the complementary prism sheet 30 as shown in FIG. 2 has a refraction angle θ at the incidence surface of the inverse prism 22 as compared with the prism sheet 20 shown in FIG. As a result, as shown in FIG. 3, a part of the refracted light is emitted without being incident on the reflecting surface of the inverted prism 22, and is lost as it is. In the complementary prism sheet 30, about 30% of the light incident from the light guide plate is refracted at the incidence surface of the inverse prism 22, And is lost. Since the light collection efficiency of the prism sheet is determined by the vertical output light that is emitted vertically toward the liquid crystal panel, the loss of light decreases the light collection efficiency, and as a result, the luminance efficiency of the liquid crystal display device decreases. In FIG. 3, when a length corresponding to between the neighboring mountains and the mountains of the inverted prism 22 or between the adjacent bones and the valley is defined as one pitch, one pitch corresponds to the loss area PA corresponding to the lost light, And a light converging region PB corresponding to the light. In order to improve the light condensing efficiency, the loss area (PA) must be minimized in one pitch.

Accordingly, it is an object of the present invention to provide an optical sheet and a liquid crystal display device including the optical sheet, which can solve the prism breakage problem and increase the light condensing efficiency.

According to an aspect of the present invention, there is provided an optical sheet comprising: a base film; A prism layer formed on the base film and including a plurality of reverse prisms having a first refractive index; An interference prevention layer formed on the prism layer to cover the inverse prisms and having a second refractive index smaller than the first refractive index; And a plurality of reflectors formed between the base film and the inverse prisms to provide additional reflective surfaces connected to the reflective surfaces of the inverse prisms.

Wherein each of the inverse prisms includes an incident surface on which light incident from the interference preventing layer is refracted and a reflecting surface for vertically reflecting the refracted light on the incident surface toward the base film; A plurality of first regions corresponding to the left pitches of the reverse prisms including the incident surface and a plurality of second regions corresponding to right pitches of the reverse prisms including the reflection surfaces, Lt; / RTI > The reflectors are formed in the first areas.

The additional reflecting surface of each of the reflectors is formed alongside the reflecting surface of each of the inverse prisms.

An additional reflecting surface of each of the reflectors is formed perpendicular to the base film.

The acute angle formed between the additional reflective surface of each of the reflectors and the base film is larger than the acute angle formed between the reflective surface of each of the inverted prisms and the base film and smaller than an angle perpendicular to the base film.

According to another aspect of the present invention, there is provided a liquid crystal display comprising: a backlight unit including a light source and an optical sheet for condensing light emitted from the light source; And a liquid crystal panel positioned on the backlight unit and displaying an image based on light emitted from the optical sheet; The optical sheet includes: a base film; A prism layer formed on the base film and including a plurality of reverse prisms having a first refractive index; An interference prevention layer formed on the prism layer to cover the inverse prisms and having a second refractive index smaller than the first refractive index; And a plurality of reflectors formed between the base film and the inverse prisms to provide additional reflective surfaces connected to the reflective surfaces of the inverse prisms.

The present invention resides in that a prism sheet is constituted by using an interference prevention layer together with an inverse prism to solve the problem of breaking the inverse prisms and arranging reflectors connected to each of the inverse surfaces of the inverse prisms between the inverse prisms and the base film, At least one of the light converging efficiency improvement and the viewing angle improving effect can be easily realized.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram showing that light incident on a conventional prism sheet is condensed. Fig.
FIG. 2 is a view showing a conventional complementary prism sheet that overcomes the problem of FIG. 1; FIG.
FIG. 3 is a schematic view showing that loss light is generated in a conventional complementary prism sheet. FIG.
4 is an exploded perspective view illustrating a liquid crystal display device according to an embodiment of the present invention.
5 is a cross-sectional view of the prism sheet taken along line I-I 'of FIG. 4;
6 is a schematic diagram showing that the light condensing efficiency is increased by minimizing the loss of light in the prism sheet of the present invention.
FIGS. 7A and 7B are views showing examples of forming angles of the reflector of the present invention with respect to additional reflecting surfaces. FIG.
8A is a view showing a structure of a reflector for maximizing a luminance rising efficiency.
8B is a view showing a structure of a reflector for enhancing a viewing angle improving effect;
9A to 9H are views sequentially illustrating a method of manufacturing a prism sheet according to the present invention.

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

4 is an exploded perspective view illustrating a liquid crystal display device according to an embodiment of the present invention.

4, a liquid crystal display 100 according to an exemplary embodiment of the present invention includes a bottom cover 110, a reflection plate 120 disposed on the bottom cover 110, a light guide plate 120 disposed on the reflection plate 120, A light source 140 positioned on one side of the light guide plate 130, an optical sheet 150 positioned on the light guide plate 130, a liquid crystal panel 160 positioned on the optical sheet 150, A panel guide 170 which surrounds the edge of the bottom plate 160 and a top cover 180 which covers the panel guide 170 and is fastened to the bottom cover 110.

The bottom cover 110 and the top cover 180 serve as a case in a liquid crystal display and include a backlight unit 190 including a reflection plate 120, a light guide plate 130, a light source 140, and an optical sheet 150 And the liquid crystal panel 160 are housed. The bottom cover 110 may have a rectangular box shape, and the top cover 180 may have a rectangular frame shape.

The reflector 120 positioned on the bottom cover 110 reflects the light emitted from the light guide plate 130 toward the liquid crystal panel 160 and may be made of a metal having a high reflectance. The light guide plate 130 positioned on the reflection plate 120 guides light incident from the light source and converts the light source into a surface light source. The light guide plate 130 may be made of PMMA (Poyl Methyl Methacrylate) having a high total reflectance.

The light source 140 may be formed on at least one side or both sides of the light guide plate 130 along the major axis direction of the light guide plate 130, for example. The light emitted from the light source 140 may be incident directly into the light guide plate 130 or may be incident on the light source housing 145 (e.g., a light source housing 140) formed to surround a part of the light source 140, And then may be incident into the light guide plate 130.

The light source 140 may be an LED assembly, and the LED assembly may include a plurality of LEDs 141 arranged on the LED PCB 142. A reflection plate (not shown) is positioned on the LED PCB 142 to reflect light emitted from the LED 141. The light source 140 of the present invention is not limited thereto but may be a cold cathode fluorescent lamp (CCFL), an external electrode type fluorescent lamp fluorescent lamps (EEFL), and the like.

The optical sheet 150 positioned on the light guide plate 130 serves to diffuse or condense light incident from the light guide plate 130. The optical sheet 150 is composed of a prism sheet 154 and a diffusion sheet 152. The prism sheet 154 enhances brightness by condensing the light incident from the light guide plate 130. The diffusion sheet 152 diffuses the condensed light from the prism sheet 154 to uniform the brightness of the light. In particular, the prism sheet 154 of the present invention has a technical feature that includes an interference prevention layer to solve the problem of breaking the reverse prisms, and includes reflectors to increase the light collection efficiency in this state. The prism sheet 154 will be described in detail with reference to FIGS. 5 to 9F.

The liquid crystal panel 160 positioned on the optical sheet 150 implements an image based on the light supplied through the optical sheet 150. The liquid crystal panel 160 may include a first substrate 161 and a second substrate 162 which are bonded together with a liquid crystal layer interposed therebetween. Although not shown in the figure, a plurality of pixels may be defined on the first substrate 161, which is called a TFT array substrate, by intersecting a plurality of scan lines and data lines in a matrix form. Each pixel is provided with a thin film transistor (TFT) capable of turning on / off a signal, and a pixel electrode connected to the thin film transistor may be formed. A boundary between the color filters of red (R), green (G), and blue (B) and color filters corresponding to the plurality of pixels is partitioned on the second substrate 162 called a color filter substrate, And a black matrix for covering the data lines, the thin film transistors, and the like. A common electrode that forms an electric field opposite to the pixel electrode may be formed on either the first substrate 161 or the second substrate 162. A printed circuit board 166 may be connected to at least one side of the liquid crystal panel 160 via a flexible circuit board or a connection member 164 such as a tape carrier package (TCP). A driver IC may be mounted on the connecting member 164.

In the liquid crystal panel 160 having the above structure, when a thin film transistor is turned on in response to a scan signal supplied through a scan line, a data voltage is transferred from the data line to the corresponding pixel electrode, The arrangement direction of the liquid crystal molecules is changed by the electric field between the electrodes to express the desired gradation.

The panel guide 170 that surrounds the edge of the liquid crystal panel 160 supports the liquid crystal panel 160 by seating the liquid crystal panel 160 thereon. The panel guide 170 may have a rectangular frame shape.

5 is a cross-sectional view of the prism sheet taken along line I-I 'of FIG. 6 is a schematic diagram showing that the light condensing efficiency is increased by minimizing the loss of light in the prism sheet of the present invention.

5, a prism sheet 154 according to an exemplary embodiment of the present invention includes a base film 210, a plurality of reverse prisms 222 formed on the base film 124 and having a first refractive index, An interference preventive layer 230 formed on the prism layer 220 to cover the inverse prisms 222 and having a second refractive index smaller than the first refractive index, And a plurality of reflectors 224 formed between the plurality of inverse prisms 222 and the plurality of inverse prisms 222 to provide additional reflective surfaces connected to the respective reflective surfaces of the inverse prisms 222.

The base film 210 may be made of any material selected from the group consisting of a light-transmitting material, for example, polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polystyrene, and polyepoxy.

The prism layer 220 and the interference prevention layer 230 may also be formed of a light transmitting material similar to the base film 210. However, the second refractive index of the interference preventing layer 230 is selected to be smaller than the first refractive index of the prism layer 220. That is, when the prism layer 220 is formed of a material having a first refractive index of 1.4 to 2.0, preferably 1.6, the interference preventing layer 230 is made of a material having a second refractive index of 1.3 to 1.9, . The first and second refractive index differences may be realized by adding different additives to the prism layer 220 and the interference prevention layer 230, respectively.

Each of the inverse prisms 222 includes an incident surface 222A on which light incident from the interference preventing layer 230 is refracted and an incident surface 222B on which the light refracted by the incident surface 222A is vertically reflected toward the base film 210 And a reflecting surface 222B.

The reflectors 224 may be formed of a metal or metal alloy material having a high reflectance between the base film 210 and the inverse prisms 222. Reflectors 224 provide an additional reflecting surface 224A that is connected to the reflecting surface 222B of each of the inverse prisms 222 as shown in FIG. The additional reflecting surface 224A reflects the light incident through the "PA" in one pitch and emits the light toward the base film 210 to increase the light condensing efficiency of the prism sheet 154. In some cases, You may.

The light incident on the prism sheet 154 through the conventional "PA" is refracted only by the incident surface 222A of the inverse prism 222 and is reflected by the side surface 222B of the liquid crystal panel And was lost. Conventionally, only the light incident on the prism sheet 154 through the "PB" is condensed on the prism sheet 154. The present invention utilizes reflectors 224 to direct the optical path of the lost light as close to the direction perpendicular to the base film 210 as possible. 6 shows that the light incident on PB is refracted by the incident surface 222A of the inverse prism 222 and then totally reflected by the reflection surface 222B of the inverse prism 222 to be perpendicular to the base film 210 Light reflected from the additional reflection surface 224A of the reflector 224 after being refracted by the incident surface 222A of the inverse prism 222 and being perpendicular to the base film 210 In the direction indicated by the arrow.

The luminance rising efficiency may be improved or the viewing angle improving effect may be improved according to the forming angle of the reflector 224 with respect to the additional reflecting surface 224A.

FIGS. 7A and 7B show examples of forming angles of the reflector 224 of the present invention with respect to the additional reflecting surface 224A.

The additional reflecting surface 224A of the reflector 224 may be formed alongside the reflecting surface 222B of each of the inverted prisms 222 as shown in Fig. In this case, since the angle formed by the light emitted after being reflected by the additional reflection surface 224A of the reflector 224 with the base film is 90 degrees as shown in FIG. 8A, the luminance rising efficiency can be maximized.

The additional reflecting surface 224A of the reflector 224 may be formed perpendicular to the base film as in Fig. 7B. In this case, the angle formed between the reflection surface 222B of each of the inverse prisms 222 and the additional reflection surface 224A of the reflector 224 is "? 2 ", so that the additional reflection surface 224A of the reflector 224 The angle formed by the light emitted after being reflected and the base film becomes "? 3 ", as shown in Fig. 8B. Thus, the effect of improving the viewing angle can be maximized.

In order to achieve both of the brightness enhancement efficiency and the viewing angle improving effect, an acute angle formed between the additional reflecting surface 224A of each of the reflectors 224 and the base film is formed between the reflecting surface 222B of each of the inverse prisms 222, Is preferably larger than the acute angle? 1 formed by the film and smaller than the angle perpendicular to the base film.

8A shows a structure of a reflector for maximizing the luminance rising efficiency. 8B shows a structure of a reflector for improving the viewing angle improving effect.

8 and 8B, a plurality of first regions A1 corresponding to the left pitch of the inverse prism 222 including the incident surface 222A, and a plurality of second regions A1, A plurality of second areas A2 corresponding to the right pitches of the inverted prisms 222 including the reflecting surface 222B are formed. Here, when the length corresponding to the space between the adjacent mountains and the mountains of the inverted prism 222 or between the adjacent bones and the bones is defined as one pitch, the left pitch and the right pitch implement one pitch.

At this time, the reflectors 224 are formed in the first regions A1 so that the additional reflecting surfaces 224A thereof are connected to the reflecting surfaces of the respective inverted prisms 222. [

The reflectors 224 may have a rhombic shape as shown in FIG. 8A so as to have an additional reflecting surface 224A as in FIG. 7A.

The reflectors 224 may have a rectangular shape as shown in FIG. 8B so as to have an additional reflecting surface 224A as in FIG. 7B.

9A to 9H sequentially show a method of manufacturing a prism sheet according to the present invention.

9A, when a roll-shaped supporting film 210 is provided on the film introduction portion by driving the rollers, the present invention is characterized in that on the supporting film 210, a reflective material layer 224 ' (226 ') are sequentially formed.

9D, a photomask in which a light transmitting portion and a light shielding portion are selectively formed is disposed on a support film 210 on which a reflective material layer 224 'and a photoresist layer 226' are formed, The mask is irradiated with ultraviolet rays.

The present invention forms a photoresist pattern 226 by patterning a photoresist layer 226 'as in FIG. 9E through a photolithography process and an etching process, and patterning the reflective material layer 224' (224). In the present invention, it is possible to appropriately select the etching process conditions such as the etching material, the etching time, and the etching power necessary for the etching to obtain the reflectors 224 of the desired shape.

The present invention can remove the photoresist pattern 226 on the reflectors 224 as in Figure 9F through a development process.

The present invention forms the first resin layer on the support film 210 on which the reflectors 224 are formed in the first resinous lower part. Next, in the prism forming portion, the surface of the first resin layer on the support film 210 is pressed with a mold roller, which forms a prism pattern alternating with an acid and a bony, to form corresponding patterns, and the corresponding patterns are ultraviolet cured Thereby forming an inverse prism 222.

The second resin layer is formed to cover the reverse prism 222 on the support film 210 on which the reverse prism 222 is formed in the second resin lower part. Next, in the present invention, the second resin layer is ultraviolet cured to form the interference preventing layer 230.

As described above, according to the present invention, a prism sheet is constructed by using an anti-interference layer together with an inverse prism to solve the problem of the inversion of the inverse prisms, and the reflectors connected to each of the reflection surfaces of the inverse prisms It is possible to easily realize at least one of the improvement of the light condensing efficiency and the improvement of the viewing angle of the prism sheet.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

210: base film 220: prism layer
222: reverse prism 222A: incident surface
222B: Reflecting surface 230: Interference preventing layer
224: reflector 224A: additional reflecting surface

Claims (10)

A base film;
A prism layer formed on the base film and including a plurality of reverse prisms having a first refractive index;
An interference prevention layer formed on the prism layer to cover the inverse prisms and having a second refractive index smaller than the first refractive index; And
And a plurality of reflectors formed between the base film and the inverse prisms and providing additional reflective surfaces connected to the reflective surfaces of the inverse prisms. The method according to claim 1,
Wherein each of the inverse prisms includes an incident surface on which light incident from the interference preventing layer is refracted and a reflecting surface for vertically reflecting the refracted light on the incident surface toward the base film;
A plurality of first regions corresponding to the left pitches of the reverse prisms including the incident surface and a plurality of second regions corresponding to right pitches of the reverse prisms including the reflection surfaces, Lt; / RTI >
Wherein the reflectors are formed in the first areas. 3. The method of claim 2,
Wherein an additional reflecting surface of each of said reflectors is formed alongside the reflecting surface of each of said inverting prisms. 3. The method of claim 2,
And an additional reflecting surface of each of the reflectors is formed perpendicular to the base film. 3. The method of claim 2,
Wherein an angle formed between the additional reflecting surface of each of the reflectors and the base film is larger than an acute angle formed between the reflective surface of each of the inverse prisms and the base film and smaller than an angle perpendicular to the base film. . A backlight unit comprising: a light source; and an optical sheet for condensing the light generated from the light source; And
And a liquid crystal panel positioned on the backlight unit and displaying an image based on light emitted from the optical sheet;
In the optical sheet,
A base film;
A prism layer formed on the base film and including a plurality of reverse prisms having a first refractive index;
An interference prevention layer formed on the prism layer to cover the inverse prisms and having a second refractive index smaller than the first refractive index; And
And a plurality of reflectors formed between the base film and the inverse prisms to provide additional reflective surfaces connected to the reflective surfaces of the inverse prisms. The method according to claim 6,
Wherein each of the inverse prisms includes an incident surface on which light incident from the interference preventing layer is refracted and a reflecting surface for vertically reflecting the refracted light on the incident surface toward the base film;
A plurality of first regions corresponding to the left pitches of the reverse prisms including the incident surface and a plurality of second regions corresponding to right pitches of the reverse prisms including the reflection surfaces, Lt; / RTI >
And the reflectors are formed in the first regions. 8. The method of claim 7,
And the additional reflective surface of each of the reflectors is formed in parallel with the reflective surface of each of the reverse prisms. 8. The method of claim 7,
And an additional reflection surface of each of the reflectors is formed perpendicular to the base film. 8. The method of claim 7,
Wherein an angle formed between the additional reflecting surface of each of the reflectors and the base film is larger than an acute angle formed between the reflective surface of each of the inverse prisms and the base film and smaller than an angle perpendicular to the base film. Device.
KR1020130125828A 2013-10-22 2013-10-22 Optical sheet and liquid crystal display device comprising the same KR102053442B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200005257A (en) * 2018-07-06 2020-01-15 삼성전자주식회사 Display apparatus
WO2020223134A1 (en) * 2019-04-28 2020-11-05 Leia Inc. Method of fabricating diffractive backlight

Citations (2)

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Publication number Priority date Publication date Assignee Title
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