CN102455446B - Brightness enhancement film, optical wavelength conversion wheel assembly with brightness enhancement film and light source - Google Patents
Brightness enhancement film, optical wavelength conversion wheel assembly with brightness enhancement film and light source Download PDFInfo
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- CN102455446B CN102455446B CN201110032950.9A CN201110032950A CN102455446B CN 102455446 B CN102455446 B CN 102455446B CN 201110032950 A CN201110032950 A CN 201110032950A CN 102455446 B CN102455446 B CN 102455446B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 75
- 230000003287 optical effect Effects 0.000 title claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 49
- 239000012528 membrane Substances 0.000 claims abstract description 27
- 230000005284 excitation Effects 0.000 claims abstract description 14
- 238000004020 luminiscence type Methods 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000002985 plastic film Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000000084 colloidal system Substances 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 238000007731 hot pressing Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 239000002086 nanomaterial Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 238000005282 brightening Methods 0.000 description 4
- 239000012780 transparent material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
Abstract
The invention relates to a brightness enhancement film that comprises a plurality of prisms or prism sets, wherein the plurality of prisms or prism sets are arranged regularly on one surface of a transparent membrane; and the other surface of the transparent membrane is a smooth surface. Especially, arrangement of all the prisms or prism sets is in a radial linear shape or in a concentric annular shape as well as the arrangement in the radial linear shape or the concentric annular shape is distributed in an axially symmetrical mode. Besides, the invention also relates to an optical wavelength conversion wheel assembly with the brightness enhancement film. The optical wavelength conversion wheel assembly comprises: an optical wavelength conversion material; a base material, which is used for bearing the optical wavelength conversion material; and a wheel shaft or a fixing device for fixing the wheel shaft. And a central axis of a symmetric axis of the brightness enhancement film is superposed with a central axis of the wheel shaft. Moreover, the invention also provides a light source. The light source is characterized in that: exciting light from an excitation light source is projected to the optical wavelength conversion wheel assembly and then excited light is transmitted. According to the invention, large power light source enables brightness enhancement to be realized at low costs.
Description
Technical field the present invention relates to color for controlling light or optical device or the device of direction.
The not luminous through characteristic that but can controlled change light of background technology liquid crystal itself, thus constantly applied in demonstration field.Match with LCD panel be used to provide projection light backlight under the driving in market, constantly toward thin, bright future development.Fig. 1 has illustrated a kind of typical LCD backlight structure: optical plate 14 bottoms have reflecting surface 19, and the light being sent by side light source 18 is led and shot to liquid crystal display 20 through optical plate 14; Brightness enhancement film 10 covers on the light-emitting face of optical plate 14, wide-angle emergent light (as light R1) can be converted to low-angle light and carry out outgoing, and low-angle light (as light R4) is returned by recycling after reflection or scattering change shooting angle, thereby the luminance brightness of the positive apparent direction of raising liquid crystal display.
Described brightness enhancement film (BEF, brightness enhancement film) 10 is first disclosed as the US Patent No. 4,906,070 of Minnesota Mining and Manufacturing Company.This patent explicitly points out the structure of brightness enhancement film, as Fig. 1 comprise the smooth side of a contact light-emitting face and be positioned at opposite side by the linear array that is arranged in parallel and forms of prism.The patent No. is respectively 98804889 and 97192045 Chinese patent and discloses the improvement structure of above-mentioned brightness enhancement film 10, and one is on original structure, to have increased diffusion layer, and one is the angle of having adjusted the prism in original structure.
Along with the development of LED (light emitting diode) technology and light source technology, on the basis in traditional backlight source, increase optical wavelength conversion material, such as but not limited to fluorescent powder, produce the backlight of the emergent light with predetermined color based on light wavelength conversion because its cost is low, performance is efficiently more subject to the favor in market.Described brightness enhancement film 10 can be used to this type of backlight to carry out blast equally, concrete structure is as shown in Figure 2: the exciting light from excitation source is irradiated on fluorescent powder 2 through optical filter 1, convert low-angle light from the wide-angle stimulated luminescence (as R1) of fluorescent powder 2 to through brightness enhancement film 10 and carry out outgoing, low-angle stimulated luminescence (as R4) is reflected and is scattering into wide-angle emergent light through brightness enhancement film 10 through fluorescent powder by brightness enhancement film 10, and then has improved fluorescent powder stimulated luminescence in low-angle emergent light total amount.Optical filter 1 preferably selects that stimulated luminescence is had to reflex, thereby the stimulated luminescence that reflects brightness enhancement film 10 is dorsad further to improve the light outgoing brightness of light source.
Above-mentioned the deficiencies in the prior art part is: due to the linear array of prism, described brightness enhancement film 10 can only carry out blast in the direction of extension perpendicular to single prism, cannot provide brightening effect along the direction of extension of prism.And along with light source technology is toward the development of high-power direction, in order to increase the service life, the existing light source based on light wavelength conversion often makes optical wavelength conversion material rotate with respect to excitation beam, such as but not limited to US Patent No. 7,547, the scheme that 114 disclosed lighting devices adopt, to avoid becoming bad because of the lost efficacy light source performance that causes of the long-time illumination of optical wavelength conversion material.New type light source concerning this type of based on relative motion, described brightness enhancement film 10 is also inapplicable, concrete analysis can be with reference to figure 3a and Fig. 3 b, illustrate each prism or the prism group that are arranged in parallel with many horizontal lines, black pane represents the hot spot of exciting light, on the colour wheel of hypothesis with fluorescent powder during with brightness enhancement film as shown in Figure 3, in the time that colour wheel carries brightness enhancement film and turns to position as shown in Figure 3 a (prism trend is vertical with line of reference A), according to above-mentioned blast principle, the distribution of stimulated luminescence should along continuous straight runs (hot spot long side direction) 180 degree full-shapes luminous, vertically (hot spot short side direction) blast, disperse full-shape and be less than 180 degree, and in the time that colour wheel carries brightness enhancement film and turns to position as shown in Figure 3 b (prism trend is parallel with line of reference A), the distribution of stimulated luminescence is just contrary with Fig. 3 a situation.Therefore,, along with colour wheel rotates, the light of light source emergent light distributes will be in continuous variation.For a specific projector system or liquid crystal indicator, be to use light source that this light distributes in continuous variation.
Summary of the invention the technical problem to be solved in the present invention is for above-mentioned the deficiencies in the prior art part, and a kind of brightness enhancement film is proposed, make the blast applicable to various light sources, be especially used in high power light source based on light wavelength conversion and the various application systems of this light source.
For solving the problems of the technologies described above, basic conception of the present invention is: if will use the existing brightness enhancement film with prism array in the new type light source based on light wavelength conversion, the direction that will make undoubtedly brightness strengthen does not change with rotation, can attempt the mode of the arrangement that changes prism or prism group, axisymmetric non-parallel arrangement should be best selection for this reason.
As the technical scheme that realizes the present invention's design be, a kind of brightness enhancement film is provided, be included in a plurality of prisms regularly arranged in the one side of transparent membrane or prism group; Each prism in each described prism or described prism group all has a side to invest on described transparent membrane; The another side of this transparent membrane is even surface; Especially, each described prism or the arrangement of prism group on this transparent membrane are radial linear or concentric shape annular, and the rotational symmetry that is arranged in of this radial linear or concentric shape annular distributes.
Specifically, in such scheme, each described prism or prism group and described transparent membrane are integrated.
In such scheme, be each prism of radial linear arrangement or prism group and invest side on described transparent membrane trapezoidal, strip triangular in shape, rectangular or its combination.Be each prism of concentric shape ring shooting or the side of prism group on described transparent membrane ringwise or ring segment.
As the technical scheme that realizes the present invention design still, a kind of light wavelength conversion wheel component is provided, comprise optical wavelength conversion material and carry the base material of this optical wavelength conversion material, especially, also comprise the brightness enhancement film described in above-mentioned each scheme, the even surface of this brightness enhancement film joins with described optical wavelength conversion material or base material, and has air-gap between this even surface and optical wavelength conversion material; Also comprise a wheel shaft or be used for fixing the stationary installation of wheel shaft, the axis of symmetry of described brightness enhancement film overlaps with the axis of described wheel shaft.
In such scheme, described base material is the optical filter of transmission exciting light and reflection stimulated luminescence, and optical wavelength conversion material is applied on this optical filter with the form of coating or pad pasting; Described even surface and described optical wavelength conversion material join and leave described air-gap.
In such scheme, light wavelength conversion wheel component entirety is wheel sheet, and outer rim comprises each layer structure lock ring tightening device together.
As the technical scheme that realizes the present invention design still, a kind of light source is provided, comprises excitation source, especially, also comprise the light wavelength conversion wheel component described in above-mentioned each scheme, and control this light wavelength conversion wheel component and the servomechanism installation of described excitation source in relative motion; Project toward this light wavelength conversion wheel component and then transmit stimulated luminescence from the exciting light of excitation source.
Adopt above-mentioned each technical scheme, there is the realization of being easy to, low cost and the advantage of the cost performance height that brings.
Brief description of the drawings Fig. 1 has illustrated the application structure of existing brightness enhancement film on liquid crystal indicator;
Fig. 2 has illustrated the application of existing brightness enhancement film on the light source based on light wavelength conversion;
Result of use after Fig. 3 has illustrated existing brightness enhancement film to rotate with runner, wherein Fig. 3 a and Fig. 3 b have represented respectively two kinds of locational situations;
Fig. 4 has illustrated prism or prism group arrangement mode on brightness enhancement film of the present invention, and wherein Fig. 4 a has illustrated along the circumference arrangement mode that detours, and Fig. 4 b has illustrated radially linear array;
Fig. 5 has illustrated the three-dimensional view of a kind of brightness enhancement film embodiment that adopts Fig. 4 a structure;
Fig. 6 a has illustrated the cut-open view on Fig. 5 embodiment diameter in office; Fig. 6 b has illustrated a kind of alternative embodiment of Fig. 6 a;
Fig. 7 has illustrated the top view of a kind of brightness enhancement film embodiment that adopts Fig. 4 b structure;
Fig. 8 a and Fig. 8 b have illustrated respectively the view that Fig. 7 embodiment views from elevation angle angle and side;
Fig. 9 has illustrated the structure of the light wavelength conversion wheel that uses brightness enhancement film of the present invention;
Figure 10 has illustrated light source to use the light collecting effect of Fig. 9 light wavelength conversion wheel.
Below embodiment, the most preferred embodiment shown in by reference to the accompanying drawings is further set forth the present invention.
Brightness enhancement film of the present invention, is included in a plurality of prisms regularly arranged in the one side of transparent membrane or prism group; Each prism in each described prism or described prism group all has a side to invest on described transparent membrane; The another side of this transparent membrane is even surface; Each described prism or the arrangement of prism group on this transparent membrane should be radial linear or concentric shape annular as shown in Figure 4, and the rotational symmetry that is arranged in of this radial linear or concentric shape annular distributes.Wherein Fig. 4 a has illustrated each prism or prism group along the circumference arrangement mode that detours, and Fig. 4 b has illustrated each prism or radially linear array of prism group.In described prism, the drift angle relative with above-mentioned side is generally acute angle, right angle or obtuse angle, but the convenience of not getting rid of for processing is designed to arc; That is, at the top of described prism or prism group, make relative with described side two planes or crossing point-blank, or bend to a round and smooth cambered surface in intersection.Prism group refers to the combination of the prism that comprises two or more different size.Each described prism or prism group and described transparent membrane are designed to one-body moldedly will greatly reduce processing cost.
Consider that brightness enhancement film of the present invention is mainly used in rotating disk, described transparent membrane is preferably rounded or annular, and described axisymmetric axis of symmetry is designed to the center of circle through this circle or annular.Fig. 5 has illustrated a kind of embodiment of brightness enhancement film of the present invention, and each prism or prism group are concentric shape ring shooting on described transparent membrane, and each prism is from forming a circle, and it invests side on transparent membrane ringwise.If being divided, each prism in this embodiment is cut into several prisms, the side of each prism of these several prisms section ringwise.Fig. 6 a is the radial cross-section of Fig. 5 embodiment, and the drift angle of each prism is roughly rectangular as seen.Fig. 6 b is a kind of alternative embodiment of Fig. 6 a, and the drift angle of each prism is obtuse angle.Fig. 6 a or Fig. 6 b be as embodiment, is not exhaustive to brightness enhancement film of the present invention.All brightness enhancement films that meets spirit of the present invention all will fall into protection domain of the present invention.
Fig. 7 is the top view that adopts a kind of brightness enhancement film of Fig. 4 b structure.Fig. 8 a and Fig. 8 b have illustrated respectively the view that it views from the elevation angle and side.Obviously, be each prism of radial linear arrangement or prism group and invest side on described transparent membrane by (prism is taking the center of circle as starting point is outwards arranged) triangular in shape or rectangular trapezoidal (prism is not taking the center of circle as starting point is outwards arranged).Even, described side can also be strip, and the strip of different length can make brightness enhancement film even density alternately as far as possible.
Fig. 9 has illustrated to adopt the light wavelength conversion wheel component of brightness enhancement film of the present invention, comprise optical wavelength conversion material 2 and carry the base material 1 of this optical wavelength conversion material, the even surface of brightness enhancement film 3 joins with described optical wavelength conversion material 2 or base material 1, and has air-gap between this even surface and optical wavelength conversion material 2.Light wavelength conversion wheel component also comprises a wheel shaft or is used for fixing the stationary installation of wheel shaft, and the axis of symmetry of described brightness enhancement film overlaps with the axis of described wheel shaft, thereby brightness enhancement film can not affect blast effect because of the motion of light wavelength conversion wheel component.Described optical wavelength conversion material comprises fluorescent powder, nano material or luminescent dye, can combine by one or more transparent material, so that light source has the stable light characteristic that goes out.Taking but be not limited to fluorescent powder as example, transparent material can be transparent colloid or transparent glass material, mixes or fuse moulding with fluorescent powder; Also can be transparent plastic film material, by fluorescent powder hot pressing on this transparent plastic film material.For thering is the moistureproof fluorescent powder requiring, can also clamp described fluorescent powder with above-mentioned any transparent material of mentioning, and can further seal.For ease of optical wavelength conversion material heat radiation, optical wavelength conversion material preferably distributes with layer in the form of sheets.In addition, for improving the absorptivity of optical wavelength conversion material to light, can also in optical wavelength conversion material, sneak into scattering particles, such as but not limited to titan oxide particles or alumina particle.Described base material can be above-mentioned transparent material, preferably also has certain thermal diffusivity.
For easy to use, the best entirety of light wavelength conversion wheel component of the present invention is wheel sheet, and as shown in Figure 9, outer rim comprises each layer structure lock ring tightening device 5 together.
The light source that adopts light wavelength conversion wheel component of the present invention, comprises excitation source, and controls this light wavelength conversion wheel component and the servomechanism installation of described excitation source in relative motion; Project toward this light wavelength conversion wheel component and then transmit stimulated luminescence from the exciting light of excitation source.Base material 1 in Fig. 9 can also be replaced by optical filter, is used for transmission exciting light and reflection stimulated luminescence, and to strengthen the outgoing brightness of stimulated luminescence, optical wavelength conversion material is by apply or the form of pad pasting is applied on this optical filter; Described even surface and optical wavelength conversion material join and leave described air-gap.Or, an optical filter is arranged on below described base material 1, be used for transmission exciting light and reflection stimulated luminescence.Further, can also on the even surface of described brightness enhancement film, be coated with filter membranous layer, be used for reflecting exciting light and transmission stimulated luminescence.This filter membranous layer plays the effect being close with described optical filter, or contributes to improve the utilization factor of light source to exciting light and the exitance to stimulated luminescence together with described optical filter.
Described excitation source can be Sony ericsson mobile comm ab, such as but not limited to LED or the Laser Devices of sending out UV light.Described servomechanism installation or drive described excitation source to detour, or drive the wheel shaft of light wavelength conversion wheel component to drive light wavelength conversion wheel component rotation; Or drive light wavelength conversion wheel component rotation by gear drive.
In order to reach predetermined brightening effect, in the light wavelength conversion wheel component or light source with brightness enhancement film of the present invention, can also include two or more brightness enhancement film simultaneously, they have different prism arrangement rules, for example the brightness enhancement film 3 in Fig. 9 adopts Fig. 5 embodiment, the second brightness enhancement film 4 adopts Fig. 7 embodiment, through experiment, its result of use as shown in figure 10, if represent the collection half-angle of light-emitting phosphor in figure with horizontal ordinate, ordinate represents total luminous energy of collecting in corresponding collection angle, can find out: when collection angle very large, as spent higher than 70 time, due to the effect of energy conservation, use brightness enhancement film not have advantage, but because the collection efficiency of wide-angle light is low, simultaneously lighting angle be also subject to projection chip area in optical projection system restriction and can not be too large, the collection angle that is used for the light source of optical projection system is often designed to 40 degree to 60 degree, at 40 degree places, use one deck brightness enhancement film can make the gross energy of collecting strengthen 57%, two-layerly can strengthen 51%, brightening effect is very obvious, and for the light source that is less than 40 degree light collection angle, use the brightening effect of one deck or two-layer brightness enhancement film more obvious.
Claims (13)
1. a light wavelength conversion wheel component, comprises optical wavelength conversion material and carries the base material of this optical wavelength conversion material, it is characterized in that:
Also comprise brightness enhancement film, this brightness enhancement film comprises a transparent membrane, regularly arranged a plurality of prisms or prism group in the one side of this transparent membrane; Each prism in each described prism or described prism group all has a side to invest on described transparent membrane; The another side of this transparent membrane is even surface; Described prism or the arrangement of prism group on this transparent membrane are radial linear or concentric shape annular, and the rotational symmetry that is arranged in of this radial linear or concentric shape annular distributes;
Between the even surface of described brightness enhancement film and optical wavelength conversion material, there is air-gap;
Also comprise a wheel shaft or be used for fixing the stationary installation of wheel shaft, the axis of symmetry of described brightness enhancement film overlaps with the axis of described wheel shaft.
2. light wavelength conversion wheel component according to claim 1, is characterized in that: at the top of described prism or prism group, relative with described side two planes or crossing point-blank, or bend to a round and smooth cambered surface in intersection.
3. light wavelength conversion wheel component according to claim 1, is characterized in that, described transparent membrane is rounded or annular, and described axisymmetric axis of symmetry is through the center of circle of this circle or annular.
4. light wavelength conversion wheel component according to claim 1, is characterized in that, each described prism or prism group and described transparent membrane are integrated.
5. light wavelength conversion wheel component according to claim 1, is characterized in that, is each prism of radial linear arrangement or prism group and invests described side on described transparent membrane trapezoidal, strip triangular in shape, rectangular or its combination.
6. light wavelength conversion wheel component according to claim 1, is characterized in that, is each prism of concentric shape ring shooting or the described side of prism group on described transparent membrane ringwise or ring segment.
7. light wavelength conversion wheel component according to claim 1, is characterized in that, described optical wavelength conversion material comprises fluorescent powder, nano material or luminescent dye.
8. light wavelength conversion wheel component according to claim 1, is characterized in that: described base material is transparent colloid or transparent glass material, mixes or fuse moulding with optical wavelength conversion material; Or be transparent plastic film material, described optical wavelength conversion material by hot pressing on this transparent plastic film material.
9. light wavelength conversion wheel component according to claim 1, is characterized in that, also comprises optical filter, at the described optical wavelength conversion material another side of brightness enhancement film dorsad, be used for transmission exciting light and reflection stimulated luminescence.
10. according to the light wavelength conversion wheel component described in claim 1 to 9 any one, it is characterized in that, on the even surface of described brightness enhancement film, be coated with filter membranous layer, be used for reflecting exciting light and transmission stimulated luminescence.
11. light wavelength conversion wheel components according to claim 1, is characterized in that, described base material is the optical filter of transmission exciting light and reflection stimulated luminescence, and optical wavelength conversion material is applied on this optical filter with the form of coating or pad pasting; Between described even surface and described optical wavelength conversion material, leave described air-gap.
12. light wavelength conversion wheel components according to claim 1, is characterized in that, this light wavelength conversion wheel component entirety is wheel sheet, and outer rim comprises each layer structure lock ring tightening device together.
13. 1 kinds of light sources, comprise excitation source; It is characterized in that:
Also comprise the light wavelength conversion wheel component as described in claim 1～12 any one, and control this light wavelength conversion wheel component and the servomechanism installation of described excitation source in relative motion; Also comprise from the exciting light of excitation source and project toward this light wavelength conversion wheel component and then transmit stimulated luminescence.
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| CN201110032950.9A CN102455446B (en) | 2011-01-28 | 2011-01-28 | Brightness enhancement film, optical wavelength conversion wheel assembly with brightness enhancement film and light source |
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| CN201110032950.9A CN102455446B (en) | 2011-01-28 | 2011-01-28 | Brightness enhancement film, optical wavelength conversion wheel assembly with brightness enhancement film and light source |
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| CN102455446B true CN102455446B (en) | 2014-11-12 |
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| CN104949070A (en) * | 2014-03-27 | 2015-09-30 | 玉晶光电股份有限公司 | Spectrum conversion assembly and manufacturing method thereof |
| CN105824065A (en) * | 2015-01-08 | 2016-08-03 | 深圳市绎立锐光科技开发有限公司 | Multi-segment scattering wheel and manufacturing method thereof, light source system and projection system |
| CN111357010B (en) * | 2019-06-28 | 2023-09-22 | 深圳市汇顶科技股份有限公司 | Enhancement film for an off-screen optical fingerprint sensor |
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| JP2002049324A (en) * | 2000-07-31 | 2002-02-15 | Nippon Seiki Co Ltd | Back light device |
| CN100464227C (en) * | 2005-11-02 | 2009-02-25 | 群康科技(深圳)有限公司 | Backlight module, liquid crystal display device of using the backlight module |
| US7547114B2 (en) * | 2007-07-30 | 2009-06-16 | Ylx Corp. | Multicolor illumination device using moving plate with wavelength conversion materials |
| CN101805602B (en) * | 2009-02-18 | 2014-03-26 | 深圳市绎立锐光科技开发有限公司 | Encapsulating method and structure of optical wavelength conversion material |
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