[go: up one dir, main page]

WO2014007508A1 - Feuille optique à prisme inversé, unité de rétroéclairage comportant cette feuille, et dispositif d'affichage à écran plat comportant cette feuille - Google Patents

Feuille optique à prisme inversé, unité de rétroéclairage comportant cette feuille, et dispositif d'affichage à écran plat comportant cette feuille Download PDF

Info

Publication number
WO2014007508A1
WO2014007508A1 PCT/KR2013/005850 KR2013005850W WO2014007508A1 WO 2014007508 A1 WO2014007508 A1 WO 2014007508A1 KR 2013005850 W KR2013005850 W KR 2013005850W WO 2014007508 A1 WO2014007508 A1 WO 2014007508A1
Authority
WO
WIPO (PCT)
Prior art keywords
prism
optical sheet
layer
angle
light
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2013/005850
Other languages
English (en)
Korean (ko)
Inventor
민지홍
고재호
이동철
구교욱
이정민
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LMS Co Ltd
Original Assignee
LMS Co Ltd
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 LMS Co Ltd filed Critical LMS Co Ltd
Publication of WO2014007508A1 publication Critical patent/WO2014007508A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays

Definitions

  • the present invention relates to an inverted prism type optical sheet, and more particularly, to an inverted prism type optical sheet having improved reliability and durability, and a backlight unit having the same and a flat panel display device having the same.
  • liquid crystal display requires a backlight unit that provides uniform light to the entire screen, unlike a conventional CRT.
  • FIG. 1 is an exploded perspective view of a conventional backlight unit.
  • the conventional backlight unit includes a lamp 1 which is a linear light source and a lamp reflector 2 reflecting light from the lamp 1 faces the light from the lamp 1. It is arranged on one side of the light guide plate 3 for changing to a light source, and a reflecting sheet 4 for preventing light leakage is disposed under the light guide plate 3.
  • the light guide plate 3 includes a diffusion sheet 5 for uniformly diffusing light, and a plurality of triangular linear prisms 8 and 9 protruding upwards to collect scattered light thereon.
  • the branches are placed on the prism sheets 6 and 7.
  • the two prism sheets 6 and 7 are arranged such that the linear prisms 8 and 9 are perpendicular to each other, so that light is collected in different directions, and the prism sheet 9 on the upper prism sheet 9 is caused by scratches or foreign matters.
  • the protective sheet 10 is disposed to prevent defects such as nailing.
  • the conventional backlight unit as described above requires two prism sheets 6 and 7 as shown in FIG. 1, which increases the manufacturing cost and increases the number of processes and limits the thickness of the backlight unit. There is a problem.
  • the inverted shape of the prism 12 is protruded in a lower side, that is, in a direction toward the light guide plate 3 as opposed to the conventional one.
  • a prism sheet 11 in the form of a prism has been developed.
  • the prism sheet 11 having an inverted prism shape has the light incident from the light guide plate 3 being totally reflected on the inner side of the prism and exiting upwards. There is an advantage in that.
  • the prism sheet of the inverted prism type as described above also has a problem.
  • the protruding prism acid faces the light guide plate 3
  • the vertices of the prism 12 are pressed by the force pressed during the assembly and use environment. 3) scratches occur in the light guide plate 3 by being pressed in contact with the light guide plate, or optical properties are changed due to the damage of the vertices of the prism 12, resulting in a problem of poor reliability and durability.
  • an object of the present invention is to provide an optical sheet of the anti-prism type with improved reliability and durability, a backlight unit having the same and a flat panel display device having the same.
  • a prism layer and a second refractive index are formed of a material having a first refractive index, a plurality of mountains of the reverse prism shape protruding on one side and parallel to each other,
  • the inverted prism shape includes a coating layer formed on a side of the prism layer protruding from the top surface of the prism layer and covering both the vertices and the valleys of the prism layer.
  • An optical sheet of is provided.
  • the second layer of the coating layer is configured such that light incident on the first surface of the acid through the coating layer is totally reflected at the second surface of the acid and is emitted to the other side, which is a surface opposite to the one side of the prism layer.
  • the refractive index may be lower than the first refractive index of the prism layer.
  • the incident light is normal to the boundary surface of the other side of the prism layer such that light incident on the first side of the acid through the coating layer is totally reflected at the second side of the acid and exits to the other side of the prism layer. It can be incident to form an angle range from 65 to 85 degrees from.
  • the other side of the prism layer and one side of the coating layer may be formed flat.
  • a first protrusion may be formed to diffuse the emitted light.
  • a second protrusion may be further provided to protrude on one side of the coating layer such that an air layer is present on the outer surface of the one boundary surface of the coating layer.
  • a first protrusion for diffusing light emitted from the other side of the prism layer is formed, and the size of the first protrusion is greater than that of the first protrusion so that an air layer is present on one side of the coating layer outside the surface of one boundary surface of the coating layer.
  • a small second protrusion may be formed.
  • the peak is a first angle that is an angle between an imaginary normal perpendicular to the peak of the peak vertically from an interface of the other side of the prism layer and the first face of the peak and an angle between the second face of the peak Two angles may be formed identically.
  • the peak may have a first angle that is an angle between an imaginary normal that vertically peaks the peak from an interface of the other side of the prism layer and a first face of the peak, and an angle between the second face of the peak.
  • Phosphorus second angle may be formed differently.
  • the first angle which is an angle between the imaginary normal that vertically connects the peak of the mountain from the boundary surface of the other side of the prism layer and the first surface of the mountain, may be in a range of 20 to 25 degrees.
  • the second angle which is an angle between the imaginary normal connecting the vertex of the mountain vertically from the boundary surface of the other side of the prism layer and the second surface of the mountain, may be in the range of 25 to 30 degrees.
  • the difference between the first refractive index and the second refractive index may range from 0.1 to 0.35.
  • the first refractive index may be in the range of 1.60 to 1.75.
  • the second refractive index may be in the range of 1.40 to 1.50.
  • the vertex spacing of the plurality of mountains of the prism layer may range from 10 to 50 ⁇ m.
  • the prism residual layer thickness of the prism layer may be in the range of 0 to 10 ⁇ m.
  • the coating residual layer thickness of the coating layer may be in the range of 0 ⁇ 10 ⁇ m.
  • a base layer made of a transparent material may be further formed on the other side of the prism layer.
  • the base layer may be made of a material having a third refractive index higher than that of the prism layer.
  • a third protrusion may be formed to diffuse the emitted light.
  • a light source a light guide plate that emits light irradiated by the light source to another surface by changing its direction of travel by reflection and refraction, and a light guide plate provided on the other side of the light guide plate.
  • the light source the light guide plate for emitting the light irradiated by the light source to the other surface by changing the traveling direction by reflection and refraction, and is provided on the other surface side of the light guide plate, 21.
  • a backlight unit comprising an inverted prism type optical sheet according to any one of claims 1 to 20, which receives light emitted from the light guide plate and exits in the other direction, and is combined with the backlight unit and projected by the backlight unit.
  • a flat panel display apparatus having an anti-prism type optical sheet including a panel displaying an image by the light may be provided.
  • the backlight unit having the same, and a flat panel display device having the same a satisfactory effect can be obtained with only one optical sheet, thereby reducing the thickness of the backlight unit and reducing the unit cost.
  • the coating layer covers the surface of the acid in the form of inverse prism, even if pressure is applied during assembly or use, scratch does not occur on the light guide plate, and the pressure is also dispersed to prevent the damage of the structure of the acid in the form of inverse prism. As a result, there is no fear that optical characteristics may be compromised, thereby improving reliability and durability.
  • FIG. 1 is an exploded perspective view showing a conventional backlight unit having a plurality of prism sheets
  • FIG. 2 is a cross-sectional view showing a backlight unit provided with a conventional anti-prism sheet
  • FIG. 3 is an exploded perspective view showing a backlight unit having an optical sheet according to an embodiment of the present invention
  • FIG. 4 is a cross-sectional view of FIG. 3;
  • FIG. 5 is a cross-sectional view illustrating an example in which a first protrusion and a second protrusion are formed on the prism layer and the coating layer of FIG. 4;
  • FIG. 6 is a cross-sectional view illustrating an example in which a first angle and a second angle of the inverse prism mountain of FIG. 4 are formed to be the same;
  • FIG. 7 is a cross-sectional view illustrating an example in which a first angle and a second angle of the inverse prism mountain of FIG. 4 are formed different from each other;
  • FIG. 8 is a view showing a form in which light is emitted from the optical sheet
  • 11 is a graph showing the light emission form when the first angle and the second angle are each 20 degrees;
  • FIG. 13 is a graph showing an emission pattern of light when the first angle and the second angle are 22 degrees;
  • 14 is a graph showing an emission form of light when the first angle is 30 degrees and the second angle is 20 degrees;
  • 15 is a graph showing the light emission form when the first angle is 20 degrees and the second angle is 30 degrees;
  • FIG. 16 is a graph showing an emission pattern of light when the first angle is 20 degrees and the second angle is 25 degrees;
  • FIG. 17 is a graph showing an emission pattern of light when the difference between the first refractive index and the second refractive index is 0.1;
  • 19 is a graph showing the light emission form when the difference between the first and second refractive indices is 0.20;
  • 20 is a graph showing an emission pattern of light when the difference between the first refractive index and the second refractive index is 0.25;
  • FIG. 21 is a graph showing light characteristics when the first angle and the second angle are 22 degrees, and the difference between the first refractive index and the second refractive index is 0.15.
  • FIG. 21B is a graph showing ray tracing when the angle of light incident on the optical sheet is 72 degrees;
  • 21 (c) is a graph showing the viewing angle.
  • FIG. 22 is a graph illustrating an example in which a base layer is further formed on a prism layer of the optical sheet of FIG. 4;
  • 23 (a) to 23 (c) are graphs illustrating changes in characteristics of light according to changes in refractive index of the base layer 170;
  • FIG. 24 is a sectional view of another form of the inverse prism mountain of FIG. 4; FIG. And,
  • FIG. 25 is a cross-sectional view illustrating another form of the inverse prism acid of FIG. 4.
  • an optical sheet according to an embodiment of the present invention will be described by taking an example that is applied to a backlight unit of a flat panel liquid crystal display device such as an LCD or an LED panel.
  • the present invention is not necessarily limited thereto, and may be used alone as an optical sheet, or may be a backlight unit applied to other apparatuses other than the liquid crystal display device, or the characteristics and path of light such as a lighting apparatus. It may be applied to any device that changes the power.
  • the optical sheet according to the present embodiment may include a prism layer 110 and a coating layer 150.
  • the prism layer 110 is transparent to allow light to pass therethrough, and is made of a material having a first refractive index (for example, an ultraviolet curable resin, etc.), and an acid prism 120 having an inverted prism shape protruding from one side thereof. It may be formed a plurality of parallel.
  • the one side is a side in which light enters the prism layer 110, and when the optical sheet 100 is applied to the backlight unit, it may refer to the side facing the light guide plate 3 from which light L is emitted. have.
  • the acid 120 of the prism layer 110 of the present embodiment is formed in an inverse prism shape in the opposite direction.
  • the cross section of the inverted prism-shaped mountain 120 as described above forms two inclined surfaces, of which the surface on which light L is incident is called a first surface 126, and the first surface 126 is referred to as a cross section.
  • the surface through which the light L incident through is totally reflected will be referred to as a second surface 128.
  • the interval p between the acid having the inverse prism shape may be 10 ⁇ 50 ⁇ m.
  • the prism residual layer d p which is a distance from the top of the valley 124 of the inverse prism mountain 120 of the prism layer 110 to the boundary surface 111 of the other side from which the light of the prism layer 110 is emitted,
  • the thickness of may be 0 ⁇ 10 ⁇ m.
  • the coating layer 150 is transparent so that light can be transmitted, made of a material having a second refractive index (for example, UV curable resin, etc.), the acid 120 of the prism layer 110 is
  • the prism layer 110 may be filled between the mountain and the mountain of the prism layer 110 and may cover the peaks 122 of the mountain 120 to the peaks of the valleys 124.
  • the coating residual layer d c which is a distance from a point of contact with the apex of the prism acid 120 of the coating layer 150 to the interface 151 of one side on which light of the coating layer 150 is incident.
  • the thickness of may be 0 ⁇ 10 ⁇ m.
  • the second refractive index of the material forming the coating layer 150 may be lower than the first refractive index of the material forming the prism layer 110.
  • the second refractive index may have a higher value than the refractive index of air.
  • one side of the coating layer 150 may be provided with a light guide plate 3 spaced apart from one side of the boundary surface of the coating layer 150 by a predetermined interval.
  • the light guide plate 3 is configured to uniformly emit light irradiated by the light source 1 from the other side toward the optical sheet 100 of the light guide plate 3.
  • the light L emitted from the light guide plate 3 is emitted at an angle ⁇ between 65 and 85 from a normal of the other side of the light guide plate 3, and the optical sheet 100 at the above angle. May be incident on.
  • an air layer exists between the light guide plate 3 and the optical sheet 100.
  • the light L emitted from the light guide plate 3 is inclined obliquely and is incident on the coating layer 150 of the optical sheet 100 while the air and the coating layer 150 are exposed. It is primarily refracted by the difference in refractive index of, the refracted light is secondarily refracted as it is incident on the first surface 126 of the prism layer 110, and the incident light is reflected by the peaks of the prism layer 110. 120, the inside is totally reflected from the second surface 128 is emitted from the other side of the optical sheet 100.
  • the path of the light emitted obliquely from the light guide plate 3 can also be effectively changed as the optical sheet 100.
  • one side of the coating layer 150 facing the light guide plate 3 and the other side from which the light of the prism layer 110 is emitted may be formed flat. Therefore, even if the optical sheet 100 is in contact with the light guide plate 3 or other components constituting the backlight unit by an external force, it may not form a scratch on the light guide plate 3.
  • the coating layer 150 is filled between the peaks 120 and 120 in the form of inverted prism, it is formed to cover all of the peaks 122 and the peaks 124 of the peaks, so that the inverted prism Even when the optical sheet 100 is in contact with the light guide plate 3 or other components constituting the backlight unit by an external force, the optical sheet 100 does not form a scratch on the light guide plate 3, and applies pressure to the optical sheet 100. Dispersion may prevent the acid 120 from being damaged by pressure.
  • one side of the prism layer 110 has a circular or elliptical first protrusion 112 that scatters the emitted light and uniformly diffuses the light L.
  • Plural can be formed.
  • the first groove 114 may be formed in a concave intaglio shape in a circular or elliptical shape.
  • the first protrusion 112 and the first groove 114 may be formed in other forms in addition to the circular or elliptical.
  • a second projection for preventing the narrowing of the light guide plate 3 or other components such that an air layer is always present on the outer surface of one boundary surface of the coating layer 150 on one side of the light incident on the coating layer 150. 152 may be formed.
  • the coating layer 150 and the light guide plate 3 are narrowed therebetween.
  • the air layer may disappear.
  • the refraction path of the light may be changed, and thus the optical properties may be changed.
  • the second protrusion 152 is provided, thereby preventing other components such as the coating layer 150 and the light guide plate 3 from being constricted, thereby improving an air layer outside one side of the coating layer 150. To do that.
  • first protrusion 112 and the second protrusion 152 may be formed at the same time.
  • the second protrusion 152 may be formed to have a smaller size than the first protrusion 112.
  • the second protrusion may be formed in a circular or elliptical shape, but in addition, the second protrusion may be formed in various shapes and may be formed in an intaglio shape (not shown), such as the first groove 114.
  • the shape of the two protrusions 152 is not limited.
  • the peak 120 protruding in the form of an inverse prism of the prism layer 110 may be a virtual shape that vertically crosses the peak of the peak from the boundary surface of the other side of the prism layer 110.
  • the first angle ⁇ 1, which is an angle between the normal line 118, and the first surface 126 of the mountain 120, and the second angle ⁇ 2, which is an angle between the second surface 128 of the mountain, are the same. Can be formed.
  • the peak 120 protruding in the form of an inverse prism of the prism layer 110 may be formed by virtually connecting the peak of the peak perpendicularly from the boundary surface of the other side of the prism layer 110, as shown in FIG. 7.
  • the first angle ⁇ 1 which is an angle between the normal line 118, and the first surface 126 of the mountain 120
  • the second angle ⁇ 2 which is an angle between the second surface of the mountain, may be different from each other. It may be.
  • the first angle ⁇ 1 and the second angle ⁇ 2 are different from each other, the first angle ⁇ 1 may be formed at an angle smaller than the second angle ⁇ 2.
  • the first angle ⁇ 1 is formed at an angle smaller than the second angle ⁇ 2
  • the light incident through the first surface 126 does not touch the second surface 128, but the other side of the prism sheet
  • the amount of light passing to the interface side is reduced, so that the efficiency can be improved.
  • a first angle ⁇ 1 and a second angle ⁇ 2 of the inverse prism acid 120 of the prism layer 110, a first refractive index of the prism layer 110, and a second refractive index of the coating layer 150 may be used. Due to the difference in the light characteristics can be changed.
  • the characteristics of the light emitted from the optical sheet 100 are changed due to the difference between the first angle ⁇ 1 and the second angle ⁇ 2, the first refractive index, and the second refractive index.
  • the first refractive index of the prism layer 110 is 1.63
  • the second refractive index of the coating layer 150 is 1.48
  • the difference between the first refractive index and the second refractive index is fixed at 0.15.
  • the light is emitted from the center, the point of the light sheet in a vertical direction, the left, the right direction, and the point where the light is emitted from the center point.
  • the pie graph shows a distribution in which light is emitted
  • the graph on the right of the pie graph displays the intensity of light by color.
  • the circular graph is a graph showing latitude and longitude of light emitted by a hemispherical sensor at a certain point, and is a graph in plan view from an observer's point of view.
  • Latitude ranges from -90 to +90 degrees
  • longitude ranges from 0 to 360 degrees.
  • the light portion on the left side and the light portion on the right side may emit light at about -45 degrees and +45 degrees from the center, respectively.
  • the graph on the right side of the pie graph indicates that the light intensity is larger toward the upper side, and the length of each color represents the amount of light intensity. That is, the longer the graph of the upper color in the graph on the right side of the pie graph, the higher the luminance.
  • FIG. 9 is a graph when the first angle ⁇ 1 and the second angle ⁇ 2 are 30 degrees, respectively, and FIG. 10 is a graph when the first angle ⁇ 1 and the second angle ⁇ 2 are 25 degrees, respectively.
  • FIG. 11 is a graph when the first angle ⁇ 1 and the second angle ⁇ 2 are 20 degrees, and FIG. 12 is a graph when the first angle ⁇ 1 and the second angle ⁇ 2 are 22.5 degrees, respectively.
  • FIG. 13 is a graph when the first angle ⁇ 1 and the second angle ⁇ 2 are 22 degrees, respectively.
  • FIG. 14 is a graph when the first angle ⁇ 1 is 30 degrees and the second angle ⁇ 2 is 20 degrees
  • FIG. 15 is the first angle ⁇ 1 is 20 degrees and the second angle ⁇ 2 is 30 degrees
  • 16 is a graph when the first angle is 20 degrees and the second angle ⁇ 2 is 25 degrees.
  • the first angle ⁇ 1 and the second angle ⁇ 2 of the mountain 120 of the prism layer 110 are 22 degrees, respectively, and the first surface 126 and the second surface 128 have an angle of 44 degrees.
  • the experiment was performed based on the time achieved.
  • the first refractive index of the prism layer 110 is in the range of 1.60 to 1.65
  • the second refractive index of the coating layer 150 is changed in the range of 1.40 to 1.50. This is to experiment within the refractive index range of the currently commercially available and readily available materials.
  • FIG. 17 is a graph when the difference between the first refractive index and the second refractive index is 0.1
  • FIG. 18 is a graph when the difference between the first and second refractive indices is 0.15
  • FIG. 19 is the first and second refractive indices. Is a graph when the difference is 0.20
  • FIG. 20 is a graph when the difference between the first refractive index and the second refractive index is 0.25.
  • first angle ⁇ 1 and the second angle ⁇ 2 are 22 degrees, respectively, and the difference between the first refractive index and the second refractive index is 0.15, and the light incident from the light guide plate 3 is the prism layer 110.
  • Figure 21 shows the characteristics of the light at an angle of 72 degrees from the normal of the boundary surface of the other side from which light is emitted.
  • the light exit points are effectively gathered at the center point, and as shown in FIG. 21 (b), at the second surface 128 of the inverted prism mountain 120.
  • the totally reflected light is emitted at a vertical angle of about 90 degrees with the boundary surface of the other side from which the light of the prism layer 110 is emitted, and as shown in FIG. It can be seen that the viewing angle of the figure.
  • the base layer 170 may be further formed on the other side of the light emitted from the prism layer 110.
  • the base layer 170 is formed on the other side from which the light of the prism layer 110 is emitted, and the transparent material through which the light can be transmitted is, for example, polyethyleneterephthalate (PET). Can be formed.
  • PET polyethyleneterephthalate
  • the third protrusion 172 or the third groove 174 similar to the first protrusion 112 described above so as to scatter and diffuse the light emitted from the other side surface from which the light of the base layer 170 is emitted. ) May be formed.
  • the base layer 170 may be formed to a thickness of 15 ⁇ 188 ⁇ m, the refractive index may be the same as the refractive index of the prism layer 110 or have a difference of about 0.02.
  • 23 (a) to 23 (c) are graphs illustrating changes in characteristics of light according to changes in refractive index of the base layer 170.
  • FIG. 23 (a) shows that the first angle ⁇ 1 and the second angle ⁇ 2 of the inverted prism mountain are 22 degrees, respectively, and the distance p between the mountains is 50 ⁇ m, and the first prism layer 110 is formed.
  • the refractive index is 1.65
  • the second refractive index of the coating layer 150 is 1.45
  • the refractive index of the base layer 170 is 1.67 (that is, the difference between the first refractive index of the prism layer and the refractive index of the base layer is 0.02. Is shown).
  • FIG. 23 (a) shows that the first angle ⁇ 1 and the second angle ⁇ 2 of the inverted prism mountain are 22 degrees, respectively, and the distance p between the mountains is 50 ⁇ m, and the first prism layer 110 is formed.
  • the refractive index is 1.65
  • the second refractive index of the coating layer 150 is 1.45
  • the refractive index of the base layer 170 is 1.67 (that is, the difference between the first refractive index of the prism
  • FIG. 23 (b) shows that the first angle ⁇ 1 and the second angle ⁇ 2 of the inverse prism acid 120 are 22 degrees, respectively, and the distance p between the mountains is 50 ⁇ m, and the prism layer
  • the first refractive index of 110 is 1.67
  • the second refractive index of the coating layer 150 is 1.45
  • the refractive index of the base layer 170 is 1.67
  • Figure 23 (c) is the inverse prism acid
  • the first angle ⁇ 1 and the second angle ⁇ 2 of 120 are 22 degrees, respectively, and the interval p between the acids is 50 ⁇ m
  • the first refractive index of the prism layer 110 is 1.65
  • the second refractive index of the layer 150 is 1.45
  • the refractive index of the base layer 170 is 1.65 (that is, when the first refractive index of the prism layer is the same as that of the base layer).
  • the refractive index of the base layer is equal to or slightly different (about 0.02) from the first refractive index of the prism layer 110. It can be seen that there is no significant effect on the characteristic change.
  • FIG. 24 shows another form of the prism layer.
  • One side where light is incident on the prism layer 204 will be referred to as a light incident surface 241, and the other side where light will be emitted will be referred to as a light exit surface 242.
  • a plurality of prism acids are arranged on the light incident surface 241, and each prism acid has a first surface 244 to which and are incident and a second surface 245 at which total light is incident through the first surface 244. It can be made, including.
  • the second surface 245 may be formed in a plane having a plurality of different inclination angles.
  • the second surface 245 will be described with an example in which three inclination angles are formed of different planes 246, 247, and 248.
  • the inclination angles of the planes 246, 247, and 248 in which the three inclination angles are different may be closer to the light exit surface 242 as the light exit surface 242 is closer to the light exit surface 242.
  • the difference between the inclination angle between the plane 248 closest to the light exit surface and the farthest plane 246 among the planes 246, 247, and 248 in which the plurality of inclination angles constituting the second surface 245 are different is It may be 15 degrees or less.
  • the second surface 245 is formed in a plane having a plurality of different inclination angles, thereby exhibiting a very high light condensing effect and obtaining a high luminance.
  • the prism layer 204 As shown in FIG. 25, the prism layer 204 according to the present invention is referred to as a light incident surface 241 on which one side of light is incident from the prism layer, and a light emitting surface 242 of the other side on which light is emitted. It will be called.
  • a plurality of prism acids are arranged on the light incident surface 241, and each prism acid has a first surface 244 through which light is incident and a second surface 245 through which total light is incident through the first surface 244. It can be made, including.
  • either one of the first surface 244 or the second surface 245 may be formed to form a convex curved surface.
  • both the first surface 244 and the second surface 245 may form convex curved surfaces.
  • the second surface 245 is formed to form a convex curved surface.
  • the second surface 245 may be divided into two curves 253 and 254 having different curvatures.
  • Reference numerals 255 and 256 denote aspherical curves of the two curves 253 and 254 forming the second surface 245.
  • the curve forming the second surface 245 does not necessarily need to be an aspherical surface, and a curve of a spherical surface is also possible.
  • the convex curved surface preferably has a radius of curvature r in a range of 2 to 50 (r / P) with a pitch (P: pitch) of a prism row.
  • r / P the radius of curvature
  • P pitch
  • the convex curved surface preferably has a ratio in the range of 5-30 or 7-10.
  • At least h / H is 60% or less in the area of the height h of the inclination angle.
  • a plurality of different planes or convex surfaces may be formed, such as at least two or three.
  • the ratio of h / H may be 20% or more at 50% or less than 40%.
  • the maximum distance d between the imaginary plane Q and the convex curved surface connecting the top and bottom of the prism column and the ratio (d / P) to the pitch P of the prism column may be in the range of 0.4 to 5%.
  • an angle between the first surface 244 and the second surface 245 in the prism row may be in a range of 35 to 80 degrees, but is not limited thereto, and may be in a range of 35 to 70 degrees. Or 40 to 70 degrees.
  • left and right separation angles ⁇ and ⁇ with respect to the normal line of the light exit surface 242 of the prism acid may or may not be the same.
  • ⁇ is in the range of 40 degrees or less and ⁇ is in the range of 25 to 50 degrees.
  • the light utilization efficiency may be increased and luminance may be further improved.
  • ⁇ is in the range of 25 to 40 degrees and ⁇ is in the range of 25 to 45 degrees, and the difference between ⁇ and ⁇ is within 0.5 to 10 degrees.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)
PCT/KR2013/005850 2012-07-02 2013-07-02 Feuille optique à prisme inversé, unité de rétroéclairage comportant cette feuille, et dispositif d'affichage à écran plat comportant cette feuille Ceased WO2014007508A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020120071734A KR20140004347A (ko) 2012-07-02 2012-07-02 역프리즘 형태의 광학시트 및 이를 구비한 백라이트 유닛 및 이를 구비한 평판 디스플레이 장치
KR10-2012-0071734 2012-07-02

Publications (1)

Publication Number Publication Date
WO2014007508A1 true WO2014007508A1 (fr) 2014-01-09

Family

ID=49882215

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2013/005850 Ceased WO2014007508A1 (fr) 2012-07-02 2013-07-02 Feuille optique à prisme inversé, unité de rétroéclairage comportant cette feuille, et dispositif d'affichage à écran plat comportant cette feuille

Country Status (2)

Country Link
KR (1) KR20140004347A (fr)
WO (1) WO2014007508A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107209311A (zh) * 2015-01-15 2017-09-26 株式会社Lms 具有光循环提升片的反射式偏光模块以及具有其的背光单元
CN109581575A (zh) * 2018-11-12 2019-04-05 安徽亦知企业管理有限公司 一种导光板及其制备方法
CN114660869A (zh) * 2022-02-28 2022-06-24 青岛海信移动通信技术股份有限公司 一种显示模组及终端设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102250015B1 (ko) * 2012-10-30 2021-05-10 미래나노텍(주) 시야각 조절을 위한 프리즘 시트, 이를 구비하는 백라이트 어셈블리 및 액정 표시 장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090010306A (ko) * 2007-07-23 2009-01-30 (주)대광반도체 면광원 유닛의 프리즘 시트
KR20090049724A (ko) * 2007-11-14 2009-05-19 엘지디스플레이 주식회사 광학시트 및 이를 이용한 액정표시장치
KR20100024752A (ko) * 2008-08-26 2010-03-08 삼성전자주식회사 프리즘 시트와 이를 구비한 액정표시장치
KR20110023054A (ko) * 2009-08-28 2011-03-08 엘지디스플레이 주식회사 백라이트장치 및 이를 구비한 액정표시장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090010306A (ko) * 2007-07-23 2009-01-30 (주)대광반도체 면광원 유닛의 프리즘 시트
KR20090049724A (ko) * 2007-11-14 2009-05-19 엘지디스플레이 주식회사 광학시트 및 이를 이용한 액정표시장치
KR20100024752A (ko) * 2008-08-26 2010-03-08 삼성전자주식회사 프리즘 시트와 이를 구비한 액정표시장치
KR20110023054A (ko) * 2009-08-28 2011-03-08 엘지디스플레이 주식회사 백라이트장치 및 이를 구비한 액정표시장치

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107209311A (zh) * 2015-01-15 2017-09-26 株式会社Lms 具有光循环提升片的反射式偏光模块以及具有其的背光单元
CN109581575A (zh) * 2018-11-12 2019-04-05 安徽亦知企业管理有限公司 一种导光板及其制备方法
CN109581575B (zh) * 2018-11-12 2020-11-27 佛山市南海精置塑料有限公司 一种导光板
CN114660869A (zh) * 2022-02-28 2022-06-24 青岛海信移动通信技术股份有限公司 一种显示模组及终端设备

Also Published As

Publication number Publication date
KR20140004347A (ko) 2014-01-13

Similar Documents

Publication Publication Date Title
US6244719B1 (en) Surface light source device and liquid crystal display device sign display apparatus and traffic sign display apparatus using the surface light source device
KR101058298B1 (ko) 도광판 및 백라이트부
JP5199830B2 (ja) 表示装置
WO2011065806A2 (fr) Plaque de guidage de la lumière et unité de rétroéclairage
WO2016159563A1 (fr) Feuille optique et unité de rétroéclairage la comprenant
WO2014025193A1 (fr) Lentille pour diode électroluminescente, unité de rétroéclairage et dispositif d'affichage la comportant
WO2014069730A1 (fr) Plaque-guide de lumière et dispositif d'affichage transparent comprenant ladite plaque-guide
WO2014007508A1 (fr) Feuille optique à prisme inversé, unité de rétroéclairage comportant cette feuille, et dispositif d'affichage à écran plat comportant cette feuille
WO2014003389A1 (fr) Module de feuilles optiques stratifié
WO2016186410A1 (fr) Module de polarisation réfléchissant comportant des particules et unité de rétroéclairage comprenant celui-ci
WO2014104772A1 (fr) Module de feuille optique
JP2000231814A (ja) 面状照明装置
WO2013032286A1 (fr) Feuille optique
WO2013168990A1 (fr) Unité de feuilles optiques
WO2016114597A1 (fr) Module polariseur réfléchissant doté d'une feuille d'amélioration de recyclage de lumière, et unité de rétroéclairage comportant ce module
WO2014106992A1 (fr) Lentille à grand angle d'émission
EP3956722A1 (fr) Appareil d'affichage et sa plaque de diffuseur
WO2009151217A2 (fr) Feuille optique, ensemble de rétroéclairage et dispositif d'affichage à cristaux liquides comprenant la feuille optique
KR101255282B1 (ko) 프리즘 시트 및 이를 이용한 백 라이트 유닛 및액정표시장치
WO2009151260A2 (fr) Dispositif optique, unité de rétroéclairage et afficheur à cristaux liquides comprenant cette unité
WO2013094925A1 (fr) Film optique, unité de rétroéclairage comprenant celui-ci et dispositif d'affichage à cristaux liquides comprenant un film optique
WO2020171506A1 (fr) Structure optique pour dispositif à diode électroluminescente et dispositif à diode électroluminescente pour application d'éclairage comprenant celle-ci
WO2010047557A2 (fr) Film optique et son emploi dans une unité de rétro-éclairage
WO2014168387A1 (fr) Élément optique de type prisme inversé
WO2011062461A2 (fr) Feuille optique unifiée et dispositif optique la comprenant

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13813702

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13813702

Country of ref document: EP

Kind code of ref document: A1