KR101871550B1 - Optical sheet and liquid crystal display comprising the same - Google Patents
Optical sheet and liquid crystal display comprising the same Download PDFInfo
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- KR101871550B1 KR101871550B1 KR1020150075299A KR20150075299A KR101871550B1 KR 101871550 B1 KR101871550 B1 KR 101871550B1 KR 1020150075299 A KR1020150075299 A KR 1020150075299A KR 20150075299 A KR20150075299 A KR 20150075299A KR 101871550 B1 KR101871550 B1 KR 101871550B1
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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
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
-
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Elements Other Than Lenses (AREA)
- Planar Illumination Modules (AREA)
Abstract
And a prism portion including a base film and a plurality of prisms formed on a lower surface of the base film, wherein the prism portion is a light incidence surface, and the prism includes a first surface and a second surface formed adjacent to the first surface and wherein the second surface is the second surface including a curved surface, and wherein the prism is connected to, the apex of the prism T, the second R n, T and R the trough of the surface n in the cross section of the prism the one arbitrary point present between the T and R n R m, the normal to the lower surface of the base film to the normal to the lower surface of the base film through a T through the nd1, R n ndn , the normal to the lower surface of the base film through the R m ndm, angle θ the angle of the first surface and the normal nd1 forming the tangent and normal nd1 of the of the second surface θ L1, T forming R1 , the tangent and normal of Rn in the second surface When it ndn this angle is θ Rn, the second tangent and normal ndm the forming engraving inclination angle at the R m of the plane θ Rm forms, optical, including that of the optical sheet, and this satisfies the equation 1 and equation 2 A display device is provided.
Description
The present invention relates to an optical sheet and a liquid crystal display device including the same.
A liquid crystal display device is operated by emitting light from a backlight unit through a liquid crystal panel. BACKGROUND ART In recent years, an inverted prism sheet having a prism on a light incident surface has been used for a liquid crystal display device. The reverse prism sheet can increase the luminance by condensing light.
The viewer generally watches the screen of the liquid crystal display device from the front. However, the viewer can view the screen of the liquid crystal display device on the side. Therefore, the liquid crystal display device including the reverse prism sheet should have a wide viewing angle as well as a light condensing. However, there is a loss of luminance when the viewing angle is widened. In recent years, attempts have been made to change the prism shape of the reverse prism sheet in order to minimize the loss of luminance and widen the viewing angle.
The background art of the present invention is disclosed in Japanese Laid-Open Patent Application No. 2013-190779.
An object of the present invention is to provide an optical sheet in which a prism is formed on a light-entering surface and a viewing angle can be widened.
Another problem to be solved by the present invention is to provide an optical sheet in which a prism is formed on a light-entering surface, a viewing angle is widened, and a light-condensing efficiency is not reduced, thereby eliminating luminance loss.
Another problem to be solved by the present invention is to provide an optical sheet capable of widening a viewing angle and preventing condensation efficiency from being reduced, thereby reducing luminance loss, even if a prism is formed on a light incidence surface and a polarizing plate is laminated.
Another object of the present invention is to provide a liquid crystal display device including the optical sheet.
The optical sheet of the present invention includes a base film and a prism portion including a plurality of prisms formed on a lower surface of the base film, wherein the prism portion is a light incident surface, and the prism is adjacent to the first surface and the first surface Wherein the second surface comprises a curved surface and the prism has a vertex of T and a bottom point of R n , T and R n in the cross section of the prism, the normal line to the second arbitrary point present between the T and R n of the second surface that connects to the lower surface of the base film through the R m, T on the lower surface of the base film through the nd1, R n to the on normal ndn, normal to the lower surface of the base film through the R m ndm, the first surface and the normal nd1 is the angle is θ L1, the second tangent and normal nd1 of the T of the face forming angle θ R1, tangent at R n of the second surface When each of the normal make up the ndn Rn is θ, and the second tangent and normal to the forming engraving ndm inclination angle at the side of the R m to said θ Rm, can satisfy the following
<
θ R1 ≤ θ L1 ≤ θ Rn
(only, θ R1 ≠ θ L1 ≠ θ Rn)
<Formula 2>
? R1 <? Rm <? Rn
The liquid crystal display of the present invention may include the optical sheet.
The present invention provides an optical sheet in which a prism is formed on a light incidence surface and a viewing angle is widened.
The present invention provides an optical sheet in which a prism is formed on a light incidence surface, a viewing angle is widened, and a light collection efficiency is not reduced.
The present invention provides an optical sheet which has a prism formed on a light-entering surface, and a viewing angle is widened even if a polarizing plate is laminated, and the light-condensing efficiency is not reduced.
The present invention provides a liquid crystal display device including the optical sheet.
1 is a perspective view of an optical sheet according to an embodiment of the present invention.
Fig. 2 is a partial cross-sectional view of I-II in the optical sheet of Fig. 1;
3 is a schematic view of an optical path in a prism in an optical sheet according to an embodiment of the present invention.
4 is an enlarged cross-sectional view of a prism of an optical sheet according to another embodiment of the present invention.
5 is an enlarged cross-sectional view of a prism of an optical sheet according to another embodiment of the present invention.
6 is a schematic perspective view of a liquid crystal display device according to an embodiment of the present invention.
7 is a conceptual diagram of an angle of incidence of the light guide plate.
8 is a perspective view of a light guide plate according to an embodiment of the present invention.
9 shows the light profile according to the light exit angle from the light guide plate.
10 shows the relative luminance value (y axis) along the viewing angle (x axis) when the optical sheet according to Example 1 and Comparative Example 1 is applied.
The present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.
The terms "upper" and "lower" are defined with reference to the drawings, Quot; or "on" may include not only superimposition but also interposition of another structure in the middle. On the other hand, what is referred to as "directly on" or "directly above"
As used herein, the term "aspect ratio" means a ratio (maximum height / maximum width) of a maximum height to a maximum width of an optical pattern (e.g., a prism, a lenticular lens pattern, or a micro lens pattern).
As used herein, the term "radius of curvature" means a radius of a virtual circle having the curved surface as a part in an optical pattern having a curved surface.
In the present specification, the term " peak " means the point at the lowermost portion of the prism when calculated from the base film, and "low point " means the point at which the first or second surface of the prism meets the base film.
As used herein, "(meth) acrylic" means acrylic and / or methacrylic.
In the present specification, the "plane retardation (Re)" is represented by the following formula A:
<Formula A>
Re = (nx - ny) xd
(In the above formula A, nx and ny are the refractive indexes in the slow axis direction and the fast axis direction of the optical element at a wavelength of 550 nm, respectively, and d is the thickness (unit: nm) of the optical element concerned.
In the present specification, "1/2 viewing angle" means the absolute value of the viewing angle in the left direction, which is 1/2 of the front luminance value, when the front surface of the liquid crystal display device is 0 °, the right direction is + And the sum of the absolute values of the viewing angles in the right direction FWHM (Full Width at Half Maximum).
In this specification, the inclination angles,? R1 ,? L1 ,? Rn , and? Ln are both defined as angles smaller than 90 degrees.
In the drawings of the present specification, the x-axis is the light exit direction from the light source, and the x-axis, the y-axis, and the z-axis are orthogonal to each other.
Hereinafter, an optical sheet according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view of an optical sheet according to an embodiment of the present invention. Fig. 2 is a partial cross-sectional view of I-II in the optical sheet of Fig. 1; 3 is a schematic view of a light path in a prism in an optical sheet according to an embodiment of the present invention.
Referring to FIG. 1, the
The
The
The thickness of the
The
The
The
Referring to FIG. 2, the
The
When the
The
The
2, the
<
θ R1 ≤ θ L1 ≤ θ Rn
(only, θ R1 ≠ θ L1 ≠ θ Rn)
<Formula 2>
? R1 <? Rm <? Rn
This shows a case where the
Therefore, the
Referring to Figure 3, from the first surface (121a) of the
The
In one embodiment, the second side of the prism may include an area that satisfies Equation 3: Thus, the prism may have a large effect of improving the viewing angle:
<Formula 3>
? Rm1 <? Rm2
(In the formula 3, θ Rm1 is R m1 tilt angle, θ Rm2 the inclination angle at the R m2, R m1, R m2 are arbitrary point, R m1 that exists between T and R n each T than R m2 of the Lt; / RTI >
The prism is a prism having at least 90%, particularly 95% to 100%, such as 90% to 98% of the total length of one end face of the second face, . Within this range, there may be a light diffusion effect.
In one embodiment, the second surface of the prism satisfies Equation 3-1, and the inclination angle increases from T to R n , which may result in a greater effect of improving the viewing angle:
<Formula 3-1>
? R ? 1 <? Rm1 <? Rm2 <? Rm3 <? Rn
(In the above formula 3-1, θ is the inclination angle of from Rm1 R m1, θ is the inclination angle of the Rm2 from R m2, θ Rm3 are the same as defined in the inclination angle at the R m3, θ R1, θ Rn is the
The
The
The aspect ratio of the
The height H1 of the
Prism may be a width of 40% to 60% (P1) of 121, a minimum distance between the prism (121) between the low R n of normal nd1 and the
The
Although not shown in FIG. 1, the
The optical sheet according to an embodiment of the present invention can be manufactured by a conventional method. For example, in an optical sheet according to an embodiment of the present invention, a resin for forming a prism is coated on a pulling roll having an engraved pattern of the same type as that of the prism according to an embodiment of the present invention, .
Hereinafter, an optical sheet according to another embodiment of the present invention will be described with reference to FIG. 4 is an enlarged cross-sectional view of a prism of an optical sheet according to another embodiment of the present invention.
An optical sheet according to another embodiment of the present invention includes a base film and a prism portion, and the prism portion may include a plurality of prisms of FIG. Is substantially the same as the optical sheet according to an embodiment of the present invention except that it includes the prism of Fig. 4 instead of the prism of Fig. Hereinafter, only the prism of FIG. 4 will be described.
Referring to FIG. 4, the
Referring to FIG. 4, the
<Formula 4>
? L1 <? Lm <? Ln
By satisfying the expression (4), the optical sheet may have an effect of improving the viewing angle. This shows the case where the first surface of the prism is a concave surface when viewed from the inside of the prism. At this time, the first surface may have the same or different radius of curvature as the second surface.
In one embodiment, the first side of the prism may include a region that satisfies Equation 5 below: As a result, the effect of improving the viewing angle may be large.
≪ EMI ID =
? Lm1 <? Lm2
(In the formula 5, θ Lm1 is the inclination angle of the L m1, θ Lm2 is the inclination angle of the L m2, L m1, L m2 is an arbitrary point, L m1 existing between L 1 and L n each is more L m2 T).
In the prism, the area of the first surface that satisfies the above-mentioned formula 5 is 90% or more, specifically 95% to 100%, for example, 90% to 95% of the total length of one end face of the first surface, . Within this range, there may be a light diffusion effect.
In one embodiment, the first surface of the prism satisfies Equation 5-1, and the inclination angle increases from T to L n , which may result in a greater effect of improving the viewing angle:
<Formula 5-1>
? L ? 1 <? Lm1 <? Lm2 <? Lm3 <? Ln
(In the above formula 5-1, θ is the inclination angle of the L m1 Lm1, Lm2 is the inclination angle θ of the L m2, Lm3 θ is the inclination angle of the L m3, L1 θ, θ Ln are as defined in formula 4, respectively, T is a T to a low point, the order of L m1, L m2, L m3 is an arbitrary point present between the T and L n, respectively, L m1, L m2, L m3 at the surface apex, L n is the first of the prism Lt; / RTI >
At this time,? L1 may be 15 ° to 37 °, specifically 23 ° to 37 °. At this time,? Ln may be 25 ° to 45 °, specifically 33 ° to 42 °. In the above range, the light converging efficiency may not be lowered and the viewing angle may be improved.
Hereinafter, an optical sheet according to another embodiment of the present invention will be described with reference to FIG. 5 is an enlarged cross-sectional view of a prism in an optical sheet according to another embodiment of the present invention.
An optical sheet according to another embodiment of the present invention includes a base film and a prism portion, and the prism portion may include a plurality of prisms of FIG. Is substantially the same as the optical sheet according to an embodiment of the present invention except that it includes the prism of Fig. 5 instead of the prism of Fig. Hereinafter, only the prism of FIG. 5 will be described.
5, in the
≪ EMI ID =
θ L1 > θ Lm > θ Ln
(In the above Equation 6,? L1 ,? Lm ,? Ln are as defined in Equation (4) above).
This shows a case where the first surface 123a of the prism is a convex surface when viewed from inside the prism. At this time, the first surface may have the same or different radius of curvature as the second surface.
In one embodiment, the first side of the prism may include an area that satisfies Equation (7): As a result, the effect of improving the viewing angle may be large.
Equation (7)
? Lm1 >? Lm2
(In the above equation 7 ,? Lm1 and? Lm2 are as defined in the above-mentioned 5).
In the prism, the area of the first surface that satisfies the above expression 7 is 90% or more, specifically 95% to 100%, for example, 90% to 95% of the total length of one end face of the first surface, . Within this range, there may be a light diffusion effect.
In one embodiment, the first surface of the prism satisfies Equation 7-1, and the inclination angle decreases from T to L n , which may result in a viewing angle improving effect:
<Formula 7-1>
? L1 >? Lm1 >? Lm2 >? Lm3 >? Ln
(In Formula 7-1 ,? L1 ,? Lm1 ,? Lm2 ,? Lm3,? Ln are as defined in 5-1).
At this time,? L1 may be 25 ° to 45 °, specifically 33 ° to 42 °. At this time,? Ln may be 15 ° to 37 °, specifically 23 ° to 37 °.
Hereinafter, a liquid crystal display according to an embodiment of the present invention will be described with reference to FIG. 6 is a schematic perspective view of a liquid crystal display device according to an embodiment of the present invention.
6, a
Hereinafter, the
The
The
Hereinafter, the
6, the
The
The
Hereinafter, the light guide plate according to the present embodiment will be described in detail with reference to FIG.
8, the
The
The
The
The
The
The
The
The
The
The
The
The
Although not shown in FIG. 6, the liquid crystal display device may further include a polarizing plate, a liquid crystal panel, a window sheet, and the like.
Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. However, the following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited to the following examples.
Examples 1 to 3: Preparation of optical sheet
An ultraviolet ray curable resin was coated on a pull roll formed with a prismatic pattern having an intricate shape having the specifications shown in Table 1 below. One side of a polyethylene terephthalate (PET) film (thickness: 125 탆) was brought into contact with the obtained coating, and a light quantity of 200 mJ was irradiated at UV wavelength to prepare a prism sheet having a prism on one side of the PET film.
Comparative Example 1 to Comparative Example 2: Production of optical sheet
An ultraviolet ray curable resin was coated on a pull roll formed with a prismatic pattern having an intricate shape having the specifications shown in Table 1 below. One side of a polyethylene terephthalate (PET) film (thickness: 125 탆) was brought into contact with the obtained coating, and a light quantity of 200 mJ was irradiated at UV wavelength to prepare a prism sheet having a prism on one side of the PET film.
The following properties of the liquid crystal display devices prepared in Examples and Comparative Examples were evaluated, and the results are shown in Table 1 and FIG.
1. Fabrication of Light Guide Plate: A lenticular lens pattern (width: 21 mu m, height: 5.5 mu m, aspect ratio: 0.26, radius of curvature: 12 mu m) was formed on the top surface of a polycarbonate (PC) plate A micro-lens pattern (width: 30 탆, height: 2 탆, aspect ratio: 0.067) manufactured by a punching method was formed to manufacture a light guide plate.
2. Liquid crystal display assembly: A light guide plate and an optical sheet were stacked so that the lenticular lens pattern of the light guide plate and the prism of the embodiment and the comparative example were opposed to each other. A liquid crystal display device including a one-sided edge type LED light source was manufactured using an LED light source. The light emitted from the light guide plate showed an optical profile according to Fig. The viewing angle was measured using EZCONTRAST X88RC (EZXL-176R-F422A4, ELDIM). A full width at half maximum (FWHM) of 1/2 of the front luminance value was obtained based on the front face.
(탆)
(탆)
=? Rn
(°)
As shown in Table 1 and FIG. 10, the optical sheet according to the present example did not decrease the light condensing efficiency, and the optical efficiency was high, and the viewing angle was increased by 1/2.
On the other hand, as shown in Table 1 and FIG. 10, the viewing angle of Comparative Example 1 including a prism whose plane of incidence and reflection surfaces were triangular in cross section was narrower than that of the present invention. In Comparative Example 2 in which the reflective surface did not satisfy Formula 2 of the present invention as a convex surface, the viewing angle was narrower than that of the present invention.
It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (18)
Wherein the prism includes a first surface and a second surface formed adjacent to the first surface,
Wherein the second surface comprises a curved surface,
The prism may be any point that in a cross section of the prism, is present between the apex of the prism T, the low viscosity of the second side R n, T, and R n and the second T, and R n of the plane connecting the the R m, the lower portion of the base film to the normal to the lower surface of the base film through the nd1, R n the normal to the lower surface of the base film through a T through the ndn, R m ndm the normal to the surface, the first surface and the normal nd1 is the angle is θ L1, the second tangent of the angle in the θ R1, R n of the second face is tangential and normal nd1 of the T forms one plane and with the optical sheet to the normal line of ndn each meet the θ Rn, and the second when the tangential and normal ndm the forming engraving inclination angle at the R m of the surface to that θ Rm, formula 1 and formula 2 forms,
<Formula 1>
θ R1 ≤ θ L1 ≤ θ Rn
(only, θ R1 ≠ θ L1 ≠ θ Rn)
<Formula 2>
? R1 <? Rm <? Rn ,
Wherein the prism has an aspect ratio of 0.6 to 0.8,
And the second surface has a radius of curvature of 200 mu m or less.
<Formula 3>
? Rm1 <? Rm2
(In the formula 3, θ Rm1 is R m1 tilt angle, θ Rm2 the inclination angle at the R m2, R m1, R m2 are arbitrary point, R m1 that exists between T and R n each T than R m2 of the Lt; / RTI >
The tilt angle is ndm the normal to the lower surface of the base film through the arbitrary point L m, L m existing in the claim between 1 if T and L n for connecting the T and L n, said first Is defined by an angle formed by a tangent at L m and a normal ndm in the plane.
The tilt angle is ndm the normal to the lower surface of the base film through the arbitrary point L m, L m existing in the claim between 1 if T and L n for connecting the T and L n, said first Is defined by an angle formed by a tangent at L m and a normal ndm in the plane.
Wherein the light guide plate and the prism of the optical sheet are opposed to each other.
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002245824A (en) * | 2000-12-13 | 2002-08-30 | Mitsubishi Rayon Co Ltd | Light source device and light polarization element used for it |
JP2005234402A (en) * | 2004-02-20 | 2005-09-02 | Citizen Electronics Co Ltd | Backlight |
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JPH07325208A (en) * | 1994-05-31 | 1995-12-12 | Canon Inc | Prism sheet, liquid crystal display device having this prism sheet and information transmission device having this liquid crystal display device |
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Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2002245824A (en) * | 2000-12-13 | 2002-08-30 | Mitsubishi Rayon Co Ltd | Light source device and light polarization element used for it |
JP2005234402A (en) * | 2004-02-20 | 2005-09-02 | Citizen Electronics Co Ltd | Backlight |
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