CN101592754B - Optical sheet, backlight unit, and liquid crystal display - Google Patents

Optical sheet, backlight unit, and liquid crystal display Download PDF

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Publication number
CN101592754B
CN101592754B CN2008101835915A CN200810183591A CN101592754B CN 101592754 B CN101592754 B CN 101592754B CN 2008101835915 A CN2008101835915 A CN 2008101835915A CN 200810183591 A CN200810183591 A CN 200810183591A CN 101592754 B CN101592754 B CN 101592754B
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CN
China
Prior art keywords
bonding coat
optical sheet
thickness
polarizing film
diffusion layer
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Expired - Fee Related
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CN2008101835915A
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Chinese (zh)
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CN101592754A (en
Inventor
李廷勋
金庆来
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LG Electronics Inc
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LG Electronics Inc
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    • 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
    • G02B5/0226—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 having particles on the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • 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
    • G02F1/133528—Polarisers
    • G02F1/133536—Reflective polarizers
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/30—Fillers, e.g. particles, powders, beads, flakes, spheres, chips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2333/00—Polymers of unsaturated acids or derivatives thereof
    • B32B2333/04—Polymers of esters
    • B32B2333/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate

Abstract

The invention provides an optical sheet, a backlight unit including the optical sheet, and a liquid crystal display. The optical sheet includes a reflective polarizing film, a first adhesive layer on one surface of the reflective polarizing film, and a first diffusion layer on the first adhesive layer. The first diffusion layer includes a first light transmitting material and a plurality of first diffusion particles provided therein. A difference between a refractive index of the first adhesive layer and a refractive index of the first light transmitting material is less than or equal to approximately 0.2.

Description

Optical sheet, back light unit and LCD
Technical field
Embodiments of the invention relate to optical sheet, comprise the back light unit of said optical sheet and/or comprise the LCD of said back light unit.
Background technology
Field of display can show the information of various electric signal visually.In field of display, the good characteristic, the various types of flat-panel monitors that have such as slim, in light weight and low-power consumption have been introduced.In addition, flat-panel monitor is replacing cathode ray tube (CRT).
The example of flat-panel monitor comprises LCD (LCD), Plasmia indicating panel (PDP), field-emitter display (FED) and electroluminescent display (ELD).Because high contrast ratio and to the good display characteristic of moving image, LCD can be as the display panel of notebook computer, the monitor and/or the TV monitor of personal computer.
LCD can be counted as the light-receiving display.LCD can comprise the display panels of display image and be positioned at the display panels below so that the back light unit of light to be provided to said display panels.
Back light unit can comprise light source and optical sheet.Said optical sheet can comprise diffusion sheet, prismatic lens or screening glass.
If back light unit reduces to the brightness uniformity of the light that display panels provides, then the display quality of LCD possibly reduce.Diffusion sheet can allow light to be diffused into equably on the whole surface of viewing area of display panels, with the reduction of the brightness uniformity that prevents said light.But, only use diffusion sheet possibly be difficult to guarantee high light diffusing and said brightness uniformity.
Description of drawings
Can describe in detail with reference to following diagram and arrange and embodiment that similar Reference numeral is represented similar element in said diagram, in said diagram:
Fig. 1 is the viewgraph of cross-section according to the optical sheet of example embodiment of the present invention;
Fig. 2 is the viewgraph of cross-section according to the optical sheet of example embodiment of the present invention;
Fig. 3 A and 3B show the back light unit according to example embodiment of the present invention;
Fig. 3 C shows the back light unit according to example embodiment of the present invention;
Fig. 4 A and 4B show the back light unit according to example embodiment of the present invention;
Fig. 4 C shows the back light unit according to example embodiment of the present invention;
Fig. 5 A and 5B show the LCD according to example embodiment of the present invention; And
Fig. 5 C shows the LCD according to example embodiment of the present invention.
Embodiment
Fig. 1 is the viewgraph of cross-section according to the optical sheet of example embodiment of the present invention.Other embodiment and configuration are also within the scope of the invention.
More specifically, Fig. 1 shows the optical sheet 100 that comprises reflection polarizing film 110 and first diffusion layer 120 (or diffused component) on reflection polarizing film 110.First diffusion layer 120 can comprise first light transmissive material 121 and a plurality of first diffusion particles 122.First diffusion particle 122 can be embedded in first light transmissive material 121.
Reflection polarizing film 110 can transmission or is reflected the light from light source.Reflection polarizing film 110 can comprise the ground floor that is made up of polymkeric substance 111 and be oriented to the second layer 112 adjacent with ground floor 111.The second layer 112 can be made up of the polymkeric substance that has with the refractive index of polymkeric substance that constitutes ground floor 111 refractive index inequality.
Reflection polarizing film 110 can have wherein the structure of the alternated ground floor repeatedly 111 and the second layer 112.Ground floor 111 can be made up of polymethylmethacrylate (PMMA), and the second layer 112 can be made up of polyester.
From light polarizing film 110 transmissions that can be reflected of the part of the light of light source, can be by towards the said source reflection that is positioned at reflection polarizing film 110 belows from another part of the light of light source.Can be towards the light of said source reflection by secondary reflection again, and can incide on the reflection polarizing film 110.A part that incides the light on the reflection polarizing film 110 light polarizing film 110 transmissions that can be reflected, the another part that incides the light on the reflection polarizing film 110 can be by once more towards the said source reflection that is positioned at reflection polarizing film 110 belows.
In other words; Because reflection polarizing film 110 has wherein the structure of the alternated ground floor repeatedly 111 and the second layer 112; Therefore; Utilize following principle reflection polarizing film 110 can improve the efficient from the light of light source: the molecule of said polymkeric substance is got a direction, is used for the polarization that direction is different from the direction of orientation of said molecule is carried out transmission and the direction polarization identical with the direction of orientation of said molecule reflected.
Reflection polarizing film 110 can have thickness size, that be about 100 μ m to 300 μ m that depends on display device.When the thickness of reflection polarizing film 110 is equal to or greater than 100 μ m, utilize the principle of polarization and reflection can improve optical efficiency.When the thickness of reflection polarizing film 110 is equal to or less than 300 μ m, can realize slim optical sheet.
Utilize first diffusion particle 122 (and/or a plurality of bubble) in first diffusion layer 120, first diffusion layer 120 can spread the light from external light source.
For example, first light transmissive material 121 that constitutes first diffusion layer 120 can comprise unsaturated polyester (UP), methyl methacrylate, Jia Jibingxisuanyizhi, isobutyl methacrylate, n-BMA, the positive butyl ester of dimethacrylate (normal butyl methyl methacrylate), acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxy propyl methacrylate, hydroxy-ethyl acrylate, acrylic amide, NMA, GMA, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, acrylic based material, polyurethane-based material, epoxy-based material, melamine sill, polycarbonate and polystyrene such as 2-ethylhexyl acrylate polymkeric substance, 2-ethylhexyl acrylate multipolymer or 2-ethylhexyl acrylate terpolymer.Also can use other material.
First diffusion particle 122 in first diffusion layer 120 can be a pearl (bead) (for example being located in the cavity).Each said first diffusion particle 122 can be made up of the material that is selected from the group that comprises polymethylmethacrylate (PMMA), polystyrene, silicon and combination thereof.
Some said pearls can be exposed to the outside of first diffusion layer 120.
First diffusion layer 120 may further include or can comprise a plurality of bubbles substitutingly, with the light of diffusion from external light source.Can substitute first diffusion particle, 122 ground said bubble is set, perhaps can said bubble be set with first diffusion particle 122.
First diffusion layer 120 can comprise with respect to first diffusion particles 122 first light transmissive material 121,10 to 50 weight portions.When the quantity of said first diffusion particle 122 with respect to first light transmissive material 121 is equal to or greater than 10 weight portions, can prevent the difficulty that (or minimizing) utilizes said pearl (or said bubble) that the light from light source is spread.When the quantity of said first diffusion particle 122 with respect to first light transmissive material 121 is equal to or less than 50 weight portions, can prevent reduction from the optical transmission rate of light source.
The diameter that is distributed in each first diffusion particle 122 in first light transmissive material 121 can (or inhomogeneous) differing from each other.
First diffusion particle 122 can have circle, ellipse, snowman and/or level and smooth circle.Also can use other shape.
First diffusion particle 122 can be distributed in first light transmissive material 121 everywhere unevenly.
The diameter of first diffusion particle 122 can be about 0.5 μ m to 10 μ m.When the diameter of first diffusion particle 122 hour, can improve the light diffusing of optical sheet 100 through the density that increases first diffusion particle 122 in first diffusion layer 120.But, when the diameter of first diffusion particle 122 very hour, the interference of light from external light source possibly take place.Therefore, when the diameter of first diffusion particle 122 is equal to or greater than 0.5 μ m, to such an extent as to the light diffusing of optical sheet 100 can not be improved to and can take place (or can minimally take place) such degree of the interference of light.
When the diameter of first diffusion particle 122 was big, first diffusion layer 120 can be formed thick, to guarantee the light diffusing of optical sheet 100, therefore possibly be difficult to make slim optical sheet 100.Therefore, when the diameter of first diffusion particle 122 is equal to or less than 10 μ m, to such an extent as to the slimming of optical sheet 100 can not be implemented to the such degree of light diffusing that reduces (or not reducing basically) optical sheet 100.
The back light unit that comprises said optical sheet can equally be worked as what hereinafter will be described.The light that light source produces can incide on the optical sheet.A part that incides the light on the optical sheet possibly collide with first diffusion particle of first diffused component, and the travel path of said light possibly change.The another part that incides the light on the optical sheet possibly pass towards display panels first diffusion layer emitting surface.
The light that collides with first diffusion particle possibly collide with near other first diffusion particle first diffusion particle of said collision, and the travel path of light changes once more.Its travel path has changed the emitting surface that a part twice, said light possibly passed said first diffusion layer towards display panels.Its travel path has changed another part twice, said light and possibly collide with first diffusion particle, and the travel path of said light possibly change.
The light that passes the emitting surface of first diffusion layer can incide on the display panels equably.
Optical sheet 100 can also comprise first bonding coat 130 between the reflection polarizing film 110 and first diffusion layer 120.
Can come on reflection polarizing film 110, to form first diffusion layer 120 through first light transmissive material 121 being mixed with first diffusion particle 122 (and/or bubble) mutually and potpourri being applied or is coated on the reflection polarizing film 110.
Can through utilize extrinsion pressing or injection moulding to form first light transmissive material 121 and first diffusion particle 122 (or bubble) with the form of film and utilize subsequently bonding agent with it attached on the reflection polarizing film 110, come on reflection polarizing film 110, to form first diffusion layer 120.Can first bonding coat 130 be coated on the reflection polarizing film 110 to form first diffusion layer 120.
First bonding coat 130 can be made up of the material that is selected from the group that comprises acrylic based binders, rubber-based adhesive, silicon-based adhesive and combination thereof.
The example of said acrylic based binders comprises the alkyl acrylate such as ethyl acrylate, butyl acrylate, acrylic acid pentyl ester, 2-ethylhexyl acrylate, 2-ethyl hexyl acrylate, cyclohexyl acrylate and benzyl acrylate, and the alkyl methacrylate such as butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate and benzyl methacrylate.
Said rubber-based adhesive can comprise segmented copolymer as principal ingredient, and said segmented copolymer comprises natural rubber, isoprene rubber, styrene-butadiene rubber, reclaimed rubber, Oppanol, styrene-isoprene-phenylethene rubber and s-B-S rubber.
The example of said silicon-based adhesive can comprise dimethyl siloxane material and diphenyl siloxane sill.
Consider light transmission and adhesion characteristic, the thickness of first bonding coat 130 can be about 1 μ m to 10 μ m.Also can use other thickness.
The thickness of first bonding coat 130 can be following both mean value: the distance between the peak of first surface 131a and the second surface 131b, and the distance between the minimum point of first surface 131a and the second surface 131b.The average thickness of first bonding coat 130 can be about 1 μ m to 10 μ m.
Between the primary importance of first surface 131a and the second surface 131b apart from T1 can be different between the second place and the second surface 131b of first surface 131a apart from T2.Said apart from T1 and T2 can satisfy following relational expression: 10nm≤| T1-T2|≤2 μ m.T1 representes first thickness between first surface 131a and the second surface 131b, and T2 representes second thickness between first surface 131a and the second surface 131b.As shown in Figure 1, vertical range T1 and T2 are the distances along the vector of the surface plane that is substantially perpendicular to reflection polarizing film 110.
Following table 1 expression is depended on said apart from diffusion effect and the brightness relation between T1 and the T2, optical sheet 100.In the table 1 below, *, zero and ◎ represent defective mode, kilter and the good state of said characteristic respectively.
Table 1
|T1-T2|(μm) Diffusion effect Brightness
0.005 × ◎
0.01 ○ ◎
0.03 ○ ◎
0.05 ○ ○
0.1 ○ ○
0.5 ○ ○
1 ◎ ○
2 ◎ ○
5 ◎ X
Shown in above-mentioned table 1, when satisfy apart from T1 and T2 following relational expression 10nm≤| during T1-T2|, because lip-deep curved surface of first bonding coat 130 or rough surface, thereby can spread light from said light source.When satisfying following relational expression apart from T1 and T2 | during T1-T2|≤2 μ m, can prevent to reduce by the big brightness that difference in height caused of first bonding coat 130.
Difference between the refractive index of the refractive index of first light transmissive material 121 and first bonding coat 130 can be less than or equal to about 0.2.
Below the refractive index of the table 2 expression refractive index that depends on first light transmissive material 121 and first bonding coat 130 between light characteristic difference, optical sheet 100 and optical loss prevent efficient.In the table 2 below, *, zero and ◎ represent defective mode, kilter and the good state of said characteristic respectively.
Table 2
Difference between the refractive index of the refractive index of first light transmissive material and first bonding coat Light characteristic Optical loss prevention efficient
0 ◎ ◎
0.05 ◎ ◎
0.1 ○ ○
0.15 ○ ○
0.2 ○ ○
0.25 × ×
0.3 × ×
Shown in above-mentioned table 2, when the difference between the refractive index of the refractive index of first light transmissive material 121 and first bonding coat 130 is equal to or greater than 0, can prevents loss, and can improve brightness from the light of light source.When the difference between the refractive index of the refractive index of first light transmissive material 121 and first bonding coat 130 is less than or equal to approximately 0.2 the time, reflection at the interface that can be between first bonding coat 130 and first diffusion layer 120 or refraction are from the light of light source.Therefore, can prevent to reduce by the brightness that optical loss caused at this face place.
Difference between the refractive index through allowing first light transmissive material 121 and the refractive index of first bonding coat 130 is less than or equal to 0.2, and optical sheet 100 can prevent from the loss of the light of said light source and improve brightness.
Fig. 2 is the viewgraph of cross-section according to the optical sheet of example embodiment of the present invention.Other embodiment and configuration are also within the scope of the invention.
As shown in Figure 2, optical sheet 200 can comprise reflection polarizing film 210, at first bonding coat 230 on the reflection polarizing film 210 and first diffusion layer 220 on first bonding coat 230.First diffusion layer 220 can comprise first light transmissive material 221 and a plurality of first diffusion particles 222 (and/or a plurality of pearl or bubble).First diffusion particle 222 can be embedded in first light transmissive material 221.Said reflection polarizing film can comprise the ground floor 211 that is made up of polymkeric substance and be oriented to the second layer 212 adjacent with ground floor 211.
The thickness of first bonding coat 230 can be following both mean value: the distance between the peak of first surface 231a and the second surface 231b, and the distance between the minimum point of first surface 231a and the second surface 231b.The average thickness of said first bonding coat can be about 1 μ m to 10 μ m.
Optical sheet 200 also can be included in second bonding coat 240 of reflection polarizing film 210 belows and second diffusion layer 250 below second bonding coat 240.
Second bonding coat 240 can comprise the respect to one another the 3rd surperficial 241a and the 4th surperficial 241b.The 3rd surperficial 241a and/or the 4th surperficial 241b can be curved surface or rough surface.
Consider light transmission and adhesion characteristic, the thickness of second bonding coat 240 can be about 1 μ m to 10 μ m.Also can use other thickness.
The thickness of second bonding coat 240 can be following both mean value: the distance between the peak of the 4th surperficial 241b and the 3rd surperficial 241a, and the distance between the minimum point of the 4th surperficial 241b and the 3rd surperficial 241a.The average thickness of second bonding coat 240 can be about 1 μ m to 10 μ m.
Between the primary importance of the 4th surperficial 241b and the 3rd surperficial 241a apart from T3 can be different between the second place and the 3rd surperficial 24a of the 4th surperficial 241b apart from T4.With the similar ground of first bonding coat 230, said apart from T3 and T4 can satisfy following relational expression: 10nm≤| T3-T4|≤2 μ m.T3 representes the 3rd thickness between the 3rd surperficial 241a and the 4th surperficial 241b, and T4 representes the 4th thickness between the 3rd surperficial 241a and the 4th surperficial 241b.As shown in Figure 2, vertical range T3 and T4 are the distances along the vector of the surface plane that is substantially perpendicular to reflection polarizing film 210.
When said apart from T3 and T4 satisfy following relational expression 10nm≤| during T3-T4|, because lip-deep curved surface of second bonding coat 240 or rough surface and can spread light from light source.Satisfying following relational expression when said apart from T3 and T4 | during T3-T4|≤2 μ m, can prevent to reduce by the big brightness that difference in height caused of second bonding coat 240.
Second diffusion layer 250 can be identical or similar with first diffusion layer 220.Second diffusion layer 250 can spread the light from external light source through a plurality of second diffusion particles 252 (and/or bubble) in second light transmissive material 251.
For example, second light transmissive material 251 that constitutes second diffusion layer 250 can comprise unsaturated polyester (UP), methyl methacrylate, Jia Jibingxisuanyizhi, isobutyl methacrylate, n-BMA, the positive butyl ester of dimethacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxy propyl methacrylate, hydroxy-ethyl acrylate, acrylic amide, NMA, GMA, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, acrylic based material, polyurethane-based material, epoxy-based material, melamine sill, polycarbonate and polystyrene such as 2-ethylhexyl acrylate polymkeric substance, 2-ethylhexyl acrylate multipolymer or 2-ethylhexyl acrylate terpolymer.Also can use other material.
Said second diffusion particle 252 of in second diffusion layer 250 each can be pearl (for example being located in the cavity).Each said second diffusion particle 252 can be made up of the material that is selected from the group that comprises polymethylmethacrylate (PMMA), polystyrene, silicon and combination thereof.
Some said pearls can be exposed to the outside of first diffusion layer 220 and/or second diffusion layer 250.
Second diffusion layer 250 may further include or can comprise a plurality of bubbles substitutingly, with the light of diffusion from external light source.Can substitute second diffusion particle, 252 ground said bubble is set, perhaps can said bubble be set with said second diffusion particle 252.
Second diffusion layer 250 can comprise with respect to second diffusion particles 252 second light transmissive material 251,10 to 50 weight portions.When the quantity of said second diffusion particle 252 with respect to second light transmissive material 251 is equal to or greater than 10 weight portions, can prevent the difficulty that (or minimizing) utilizes said pearl that the light from light source is spread.When the quantity of said second diffusion particle 252 with respect to second light transmissive material 251 is equal to or less than 50 weight portions, can prevent reduction from the optical transmission rate of light source.
The diameter that is distributed in each second diffusion particle 252 in second light transmissive material 251 can (or inhomogeneous) differing from each other.
Second diffusion particle 252 can have circle, ellipse, snowman and/or level and smooth circle.Also can use other shape.
Second diffusion particle 252 can be distributed in second light transmissive material 251 everywhere unevenly.
The diameter of second diffusion particle 252 can be about 0.5 μ m to 10 μ m.When the diameter of second diffusion particle 252 hour, can improve the light diffusing of optical sheet 200 through the density that increases second diffusion particle 252 in second diffusion layer 250.But, when the diameter of second diffusion particle 252 very hour, the interference of light from external light source possibly take place.Therefore, when the diameter of second diffusion particle 252 is equal to or greater than 0.5 μ m, to such an extent as to the light diffusing of optical sheet 200 can not be improved to and can take place (or can minimally take place) such degree of the interference of light.
When the diameter of second diffusion particle 252 was big, second diffusion layer 250 can be formed thick, to guarantee the light diffusing of optical sheet 200, therefore possibly be difficult to make slim optical sheet 200.Therefore, when the diameter of second diffusion particle 252 is equal to or less than 10 μ m, to such an extent as to the slimming of optical sheet 200 can not be implemented to the such degree of light diffusing that reduces (or not reducing basically) optical sheet 200.
Second bonding coat 240 can be used for reflection polarizing film 210 is attached to second diffusion layer 250, and/or can be identical with first bonding coat 230.
Second bonding coat 240 can be made up of the material that is selected from the group that comprises acrylic based binders, rubber-based adhesive, silicon-based adhesive and combination thereof.
The example of said acrylic based binders comprises the alkyl acrylate such as ethyl acrylate, butyl acrylate, acrylic acid pentyl ester, 2-ethylhexyl acrylate, 2-ethyl hexyl acrylate, cyclohexyl acrylate and benzyl acrylate, and the alkyl methacrylate such as butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate and benzyl methacrylate.
Said rubber-based adhesive can comprise segmented copolymer as principal ingredient, and wherein said segmented copolymer comprises natural rubber, isoprene rubber, styrene-butadiene rubber, reclaimed rubber, Oppanol, styrene-isoprene-phenylethene rubber and s-B-S rubber.
The example of said silicon-based adhesive comprises dimethyl siloxane material and diphenyl siloxane sill.
Difference between the refractive index of the refractive index of second light transmissive material 251 and second bonding coat 240 can be less than or equal to about 0.2 basically.
When the difference between the refractive index of the refractive index of second light transmissive material 251 and second bonding coat 240 is equal to or greater than 0, can prevents loss, and can improve brightness from the light of light source.When the difference between the refractive index of the refractive index of second light transmissive material 251 and second bonding coat 240 is less than or equal to approximately 0.2 the time, reflection at the interface that can be between second bonding coat 240 and second diffusion layer 250 or refraction are from the light of light source.Therefore, can prevent that (and/or minimizing) reduced by the brightness that optical loss caused at this face place.
It is about 0.2 that difference between the refractive index through allowing second light transmissive material 251 and the refractive index of second bonding coat 240 is less than or equal to, and optical sheet 200 can prevent from the loss of the light of light source and improve brightness.
Fig. 3 A and 3B show decomposition diagram and the viewgraph of cross-section according to the configuration of the back light unit that comprises optical sheet of example embodiment of the present invention.Other embodiment and configuration are also within the scope of the invention.
Fig. 3 A and 3B show the peripheral type back light unit.Because the configuration of the optical sheet shown in Fig. 3 A and the 3B is substantially the same with above-mentioned optical sheet, therefore can further describes briefly or omit further fully and describe.
Shown in Fig. 3 A and 3B, back light unit 300 can be included in the LCD, and can light be provided to the display panels in being included in said LCD.
Back light unit 300 can comprise light source 320 and optical sheet 330.Back light unit 300 can also comprise photoconduction 340 (or LGP), reverberator 350 (or reflecting plate), bottom 360 and mould bases 370.
Light source 320 can utilize the driving energy that receives from the outside of said light source to produce light, and can launch the light that is produced.
Light source 320 can be along the long axis direction of photoconduction 340 and is positioned at a side of photoconduction 340.Light source 320 also can be positioned at the both sides of photoconduction 340.Light from light source 320 can be directly incident on the photoconduction 340.Substituting ground, can from around the part of light source 320 (such as around the outer surface of light source 320 about 3/4) light source cover 322 reflect light from light source 320, this light can incide on the photoconduction 340 then.
Light source 320 can be a kind of in cold-cathode fluorescence lamp (CCFL), hot-cathode fluorescent lamp (HCFL), external electrode fluorescence lamp (EEFL) and the printing opacity diode (LED).Also can use other light source.
Optical sheet 330 can be positioned on the photoconduction 340.Optical sheet 330 can focus on the light from light source 320.
Optical sheet 330 can comprise reflection polarizing film, at lip-deep first bonding coat and first diffusion layer on said first bonding coat of said reflection polarizing film.Said first diffusion layer can comprise first light transmissive material and a plurality of first diffusion particle (and/or pearl).Difference between the refractive index of the refractive index of said first bonding coat and said first light transmissive material can be less than or equal to about 0.2.
Can prevent the optical loss of optical sheet 330 and improve the brightness of optical sheet 330.Thereby can improve the display quality of back light unit 300.
Diffusion sheet 332 and/or prismatic lens 331 can be between photoconduction 340 and optical sheets 330.
Photoconduction 340 can be towards light source 320.Photoconduction 340 can lead to said light, upwards to launch the light from light source 320.
Reverberator 350 can be positioned at the below of photoconduction 340.Reverberator 350 can upwards reflect the light from light source 320, and said then light can be by the emission downwards via photoconduction 340.
Bottom 360 can comprise bottom 362 and 362 extend to form the sidepiece 364 of spatial accommodation from the bottom.Said spatial accommodation can hold light source 320, optical sheet 330, photoconduction 340 and reverberator 350.
Mould bases 370 can be the framework that is similar to rectangle.Can mould bases 370 be fastened to bottom 360 from the upside of bottom 360 top-downly.
Fig. 3 C shows the back light unit according to example embodiment of the present invention.Other embodiment and configuration are also within the scope of the invention.
Shown in Fig. 3 C; Except following aspect; Back light unit 300 can be substantially the same with the back light unit 300 shown in Fig. 3 A and the 3B: except first diffusion layer 220 and first bonding coat 230, optical sheet 330 also comprises second diffusion layer 250 and second bonding coat 240.Therefore, for convenience for the purpose of, omitted further description to back light unit 300.
Fig. 4 A and 4B show according to the decomposition diagram of the configuration of the back light unit of example embodiment of the present invention and viewgraph of cross-section.Other embodiment and configuration are also within the scope of the invention.
Fig. 4 A and 4B show direct type back light unit.Because the back light unit 400 shown in Fig. 4 A and the 4B and back light unit shown in Fig. 3 A and the 3B 300 substantially the same (except light source position and depend on the component variations of light source position), so can further describe briefly perhaps and can omit further description fully.
Shown in Fig. 4 A and 4B, back light unit 400 can be included in the LCD, and can light be provided the display panels in being included in LCD.
Back light unit 400 can comprise light source 420 and optical sheet 430.Back light unit 400 can also comprise reverberator 450, bottom 460, mould bases 470 and diffuser plate 480.
Light source 420 can be positioned at diffuser plate 480 belows.Therefore, the light from light source 420 can be directly incident on the diffuser plate 480.
Optical sheet 430 can be positioned on the diffuser plate 480.Optical sheet 430 can focus on the light from light source 420.
Optical sheet 430 can comprise reflection polarizing film, at lip-deep first bonding coat and first diffusion layer on said first bonding coat of said reflection polarizing film.Said first diffusion layer can comprise first light transmissive material and a plurality of first diffusion particle (and/or pearl).Difference between the refractive index of the refractive index of said first bonding coat and said first light transmissive material can be less than or equal to about 0.2.Said optical sheet 430 can be corresponding to one of optical sheet of top discussion.
The optical loss of optical sheet 430 can be prevented and the brightness of optical sheet 430 can be improved.Thereby can improve the display quality of back light unit 400.
Diffusion sheet 432 and/or prismatic lens 431 can be between diffuser plate 480 and optical sheets 430.
Diffuser plate 480 can be between light source 420 and optical sheet 430, and can upwards spread the light from light source 420.Because the diffuser plate 480 above light source 420 possibly can't see light source 420 from the top of back light unit 400, and diffuser plate 480 can further spread the light from light source 420.
Fig. 4 C shows the back light unit according to example embodiment of the present invention.Other embodiment and configuration are also within the scope of the invention.
Shown in Fig. 4 C; Except following aspect; Back light unit 400 can be substantially the same with the back light unit 400 shown in Fig. 4 A and the 4B: except first diffusion layer 220 and first bonding coat 230, optical sheet 430 also comprises second diffusion layer 250 and second bonding coat 240.Therefore, omitted further description to back light unit 400.
Fig. 5 A and 5B show according to the decomposition diagram of the configuration of the LCD of example embodiment of the present invention and viewgraph of cross-section.Other embodiment and configuration are also within the scope of the invention.
LCD 500 shown in Fig. 5 A and the 5B can comprise the back light unit shown in Fig. 3 A and the 3B.For example, LCD 500 can comprise and the similar back light unit 510 of the back light unit shown in Fig. 4 A and the 4B.Owing to described the back light unit 510 shown in Fig. 5 A and the 5B, so can carry out briefly perhaps can omitting further describing fully to back light unit 510 to the further describing of back light unit 510 above with reference to Fig. 3 A and 3B.
Shown in Fig. 5 A and 5B, LCD 500 can utilize the electro-optical characteristic of liquid crystal to come display image.
LCD 500 can comprise back light unit 510 and display panels 610.Back light unit 510 can be positioned at display panels 610 belows, and can light be provided to display panels 610.
Back light unit 510 can comprise light source 520 and optical sheet 530.Can reflect light from light source cover 522 from light source 520.Back light unit 510 can also comprise photoconduction 540, reverberator 550 (or reflecting plate), bottom 560 and mould bases 570.
Diffusion sheet 532 and/or prismatic lens 531 can be between photoconduction 540 and optical sheets 530.
Bottom 560 can comprise bottom 562 and 562 extend to form the sidepiece 564 of spatial accommodation from the bottom.
Display panels 610 can be positioned on the mould bases 570.Can fix display panels 610 through the top cover 620 that is fastened to bottom 560 top-downly.
The light that display panels 610 can utilize the light source 520 of back light unit 510 to be provided comes display image.
Display panels 610 can comprise colour filtering chip basic board 612 respect to one another and thin film transistor base plate 614, and between said colour filtering chip basic board 612 and thin film transistor base plate 614, is inserted with liquid crystal.
Colour filtering chip basic board 612 can be implemented in the color of images displayed on the display panels 610.
Colour filtering chip basic board 612 can be included in color filter array on the substrate that is made up of the transparent material such as glass or plastics, form of film.For example, colour filtering chip basic board 612 can comprise red color filter, green color filter and blue color filter.Upper deflection board can be positioned on the colour filtering chip basic board 612.
Thin film transistor base plate 614 can be electrically connected to printed circuit board (PCB) 518 through drive membrane 516, on this printed circuit board (PCB) 518, a plurality of circuit blocks is installed.Thin film transistor base plate 614 can be in response to the drive signal that is provided by printed circuit board (PCB) 518 applies the driving voltage that is provided by printed circuit board (PCB) 518 to liquid crystal.
Thin film transistor base plate 614 can be included in thin film transistor (TFT) and the pixel electrode on another substrate that is made up of the transparent material such as glass or plastics.Lower polarizing plate can be positioned at thin film transistor base plate 614 belows.
Fig. 5 C shows the LCD according to example embodiment of the present invention.Other embodiment and configuration are also within the scope of the invention.
Shown in Fig. 5 C; Except following aspect; LCD 500 can be substantially the same with the LCD 500 shown in Fig. 5 A and the 5B: except first diffusion layer 220 and first bonding coat 230, optical sheet 530 also comprises second diffusion layer 250 and second bonding coat 240.Therefore, omitted further describing to LCD 500.
According to the optical sheet of said example embodiment, comprise the back light unit of said optical sheet and comprise said back light unit LCD can through in first diffusion layer, comprise a plurality of first diffusion particles (or pearl) spread from the light of light source with improve brightness uniformity.
According to the optical sheet of said example embodiment, comprise the back light unit of said optical sheet and comprise that the LCD of said back light unit can further improve brightness uniformity through second diffusion layer that further is included in said reflection polarizing film below.
According to the optical sheet of said example embodiment, comprise the back light unit of said optical sheet and comprise refractive index that the LCD of said back light unit can be through regulating the light transmissive material that constitutes said diffusion layer and the refractive index of said bonding coat prevents the optical loss of said optical sheet and improves brightness.
According to the optical sheet of said example embodiment, comprise the back light unit of said optical sheet and comprise that the LCD of said back light unit can come diffusion light and improve brightness uniformity through between said reflection polarizing film and said diffusion layer, forming the bonding coat with curved surface, rough surface or uneven surface.
Example embodiment of the present invention can provide the optical sheet that can improve the diffuser efficiency of light, comprise the back light unit of said optical sheet and the LCD that comprises said back light unit.
A kind of optical sheet can comprise reflection polarizing film, at lip-deep first bonding coat and first diffusion layer (or element) on said first bonding coat of said reflection polarizing film.Said first diffusion layer can comprise first light transmissive material and a plurality of first diffusion particle.Difference between the refractive index of the refractive index of said first bonding coat and said first light transmissive material can be less than or equal to about 0.2.
A kind of back light unit can comprise light source and the optical sheet above said light source.Said optical sheet can comprise reflection polarizing film, at lip-deep first bonding coat and first diffusion layer (or element) on said first bonding coat of said reflection polarizing film.Said first diffusion layer can comprise first light transmissive material and a plurality of first diffusion particle.Difference between the refractive index of the refractive index of said first bonding coat and said first light transmissive material can be less than or equal to about 0.2.Said first bonding coat can have first thickness and second thickness, and said first thickness T 1 and said second thickness T 2 satisfy basically following relational expression: 10nm≤| T1-T2|≤2 μ m.
A kind of LCD can comprise light source, at optical sheet above the said light source and the display panels on said optical sheet.Said optical sheet can comprise reflection polarizing film, at lip-deep first bonding coat and first diffusion layer (or element) on said first bonding coat of said reflection polarizing film.Said first diffusion layer can comprise first light transmissive material and a plurality of first diffusion particle.Difference between the refractive index of the refractive index of said first bonding coat and said first light transmissive material can be less than or equal to about 0.2.Said first bonding coat can have first thickness and second thickness, said first thickness T 1 and said second thickness T 2 satisfy basically following relational expression: 10nm≤| T1-T2|≤2 μ m.
Any description to " embodiment ", " embodiment ", " example embodiment " or the like in this instructions means that the described specific characteristic of the said embodiment of combination, structure or characteristic are included among at least one embodiment of the present invention.This word everywhere appearance in this manual might not all be represented identical embodiment.In addition; When combining any embodiment to describe specific characteristic, structure or characteristic, proposed to combine further feature, structure or characteristic among the said embodiment to realize that this characteristic, structure or characteristic are within those skilled in the art's the limit of power.
Although with reference to many illustrative embodiments of embodiment and described said embodiment; But should be appreciated that those skilled in the art can design within the spirit of the principle that falls into present disclosure and the scope, many other modification and embodiments.More specifically, within the scope of present disclosure, accompanying drawing and appended claim, the ingredient and/or the variations and modifications aspect the layout of arranging in subject combination are feasible.Except the variation aspect said ingredient and/or the layout and revising, substituting use-pattern also will be obvious for a person skilled in the art.

Claims (19)

1. optical sheet comprises:
Reflection polarizing film;
Lip-deep first bonding coat at said reflection polarizing film; And
First diffusion layer on said first bonding coat, said first diffusion layer comprise first light transmissive material and a plurality of first diffusion particle,
Difference between the refractive index of the refractive index of wherein said first bonding coat and said first light transmissive material is less than or equal to 0.2,
Wherein said first bonding coat comprises the first surface of facing said first diffusion layer and the second surface of facing said reflection polarizing film; Wherein T1 representes the peak of said first surface and first thickness between the said second surface; T2 representes the minimum point of said first surface and second thickness between the said second surface; And T1 and T2 satisfy following relational expression: 10nm≤| T1-T2|≤2 μ m
The thickness of wherein said first bonding coat is 1 μ m to 10 μ m, and the thickness of said first bonding coat is following both mean value: the peak of first surface and the minimum point of distance between the second surface and first surface and the distance between the second surface.
2. optical sheet according to claim 1 also comprises:
Another lip-deep second diffusion layer at said reflection polarizing film.
3. optical sheet according to claim 2 also comprises:
Second bonding coat between said reflection polarizing film and said second diffusion layer, said second bonding coat comprise the 3rd surface and the 4th surface,
Wherein T3 representes the peak on said the 4th surface and the 3rd thickness between said the 3rd surface; T4 representes minimum point and the 4th thickness between said the 3rd surface on said the 4th surface, and wherein T3 and T4 satisfy following relational expression: 10nm≤| T3-T4|≤2 μ m.
4. optical sheet according to claim 3; The thickness of wherein said second bonding coat is 1 μ m to 10 μ m, and the thickness of said second bonding coat is following both mean value: the peak on the 4th surface and the distance between the 3rd surface and the 4th surperficial minimum point and the distance between the 3rd surface.
5. optical sheet according to claim 2, wherein said first bonding coat or said second bonding coat are made up of the material that is selected from the group that comprises acrylic based binders, rubber-based adhesive, silicon-based adhesive and combination thereof.
6. optical sheet according to claim 2, wherein said second diffusion layer comprise second light transmissive material and a plurality of second diffusion particle.
7. optical sheet according to claim 6, the diameter of one of wherein said second diffusion particle are 0.5 μ m to 10 μ m.
8. optical sheet according to claim 6, wherein each said diffusion particle is a pearl.
9. optical sheet according to claim 6, each in wherein said first diffusion particle or said second diffusion particle is made up of the material that is selected from the group that comprises one of polymethylmethacrylate (PMMA), polystyrene, silicon and combination thereof.
10. optical sheet according to claim 1, the diameter of one of wherein said first diffusion particle are 0.5 μ m to 10 μ m.
11. optical sheet according to claim 1, wherein said first diffusion layer also comprises a plurality of bubbles.
12. optical sheet according to claim 1, the thickness of wherein said reflection polarizing film are 100 μ m to 300 μ m.
13. optical sheet according to claim 1, wherein said reflection polarizing film comprises the ground floor and the second layer, and the refractive index of wherein said ground floor is different from the refractive index of the said second layer.
14. a back light unit comprises:
Light source; And
Be used to receive the optical sheet from the light of said light source, said optical sheet comprises:
Reflection polarizing film,
At lip-deep first bonding coat of said reflection polarizing film, and
First diffusion layer on said first bonding coat, said first diffusion layer comprise first light transmissive material and a plurality of first diffusion particle,
Difference between the refractive index of the refractive index of wherein said first bonding coat and said first light transmissive material is less than or equal to 0.2,
Wherein said first bonding coat comprises the first surface of facing said first diffusion layer and the second surface of facing said reflection polarizing film; Wherein T1 representes the peak of said first surface and first thickness between the said second surface; T2 representes the minimum point of said first surface and second thickness between the said second surface; And T1 and T2 satisfy following relational expression: 10nm≤| T1-T2|≤2 μ m
The thickness of wherein said first bonding coat is 1 μ m to 10 μ m, and the thickness of said first bonding coat is following both mean value: the peak of first surface and the minimum point of distance between the second surface and first surface and the distance between the second surface.
15. back light unit according to claim 14, wherein said optical sheet also comprises:
Another lip-deep second diffusion layer at said reflection polarizing film; And
Second bonding coat between said reflection polarizing film and said second diffusion layer, said second bonding coat comprise the 3rd surface and the 4th surface,
Wherein T3 representes the peak on said the 4th surface and the 3rd thickness between said the 3rd surface; T4 representes minimum point and the 4th thickness between said the 3rd surface on said the 4th surface, and wherein T3 and T4 satisfy following relational expression: 10nm≤| T3-T4|≤2 μ m.
16. a LCD comprises:
Light source;
Be used to receive the optical sheet from the light of said light source, said optical sheet comprises:
Reflection polarizing film,
At lip-deep first bonding coat of said reflection polarizing film, and
First diffusion layer on said first bonding coat, said first diffusion layer comprise first light transmissive material and a plurality of first diffusion particle, and
Display panels on said optical sheet,
Difference between the refractive index of the refractive index of wherein said first bonding coat and said first light transmissive material is less than or equal to 0.2,
Wherein said first bonding coat comprises the first surface of facing said first diffusion layer and the second surface of facing said reflection polarizing film; Wherein T1 representes the peak of said first surface and first thickness between the said second surface; T2 representes the minimum point of said first surface and second thickness between the said second surface; And T1 and T2 satisfy following relational expression: 10nm≤| T1-T2|≤2 μ m
The thickness of wherein said first bonding coat is 1 μ m to 10 μ m, and the thickness of said first bonding coat is following both mean value: the peak of first surface and the minimum point of distance between the second surface and first surface and the distance between the second surface.
17. LCD according to claim 16, wherein said optical sheet also comprises:
Another lip-deep second diffusion layer at said reflection polarizing film; And
Second bonding coat between said reflection polarizing film and said second diffusion layer, said second bonding coat comprise the 3rd surface and the 4th surface,
Wherein T3 representes the peak on said the 4th surface and the 3rd thickness between said the 3rd surface; T4 representes minimum point and the 4th thickness between said the 3rd surface on said the 4th surface, and wherein said T3 and T4 satisfy following relational expression: 10nm≤| T3-T4|≤2 μ m.
18. an optical sheet comprises:
Reflection polarizing film;
Lip-deep first bonding coat at said reflection polarizing film; And
First diffusion layer on said first bonding coat, said first diffusion layer comprises first light transmissive material and a plurality of bubble,
Difference between the refractive index of the refractive index of wherein said first bonding coat and said first light transmissive material is less than or equal to 0.2,
Wherein said first bonding coat comprises the first surface of facing said first diffusion layer and the second surface of facing said reflection polarizing film; Wherein T1 representes the peak of said first surface and first thickness between the said second surface; T2 representes the minimum point of said first surface and second thickness between the said second surface; And wherein T1 and T2 satisfy following relational expression: 10nm≤| T1-T2|≤2 μ m
The thickness of wherein said first bonding coat is 1 μ m to 10 μ m, and the thickness of said first bonding coat is following both mean value: the peak of first surface and the minimum point of distance between the second surface and first surface and the distance between the second surface.
19. optical sheet according to claim 18 wherein also comprises:
Another lip-deep second diffusion layer at said reflection polarizing film; And
Second bonding coat between said reflection polarizing film and said second diffusion layer, said second bonding coat comprise the 3rd surface and the 4th surface,
Wherein T3 representes the peak on said the 4th surface and the 3rd thickness between said the 3rd surface; T4 representes minimum point and the 4th thickness between said the 3rd surface on said the 4th surface, and wherein T3 and T4 satisfy following relational expression: 10nm≤| T3-T4|≤2 μ m.
CN2008101835915A 2008-05-28 2008-12-18 Optical sheet, backlight unit, and liquid crystal display Expired - Fee Related CN101592754B (en)

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