CN104865624A - Curved surface arc microstructural prism film - Google Patents
Curved surface arc microstructural prism film Download PDFInfo
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- CN104865624A CN104865624A CN201410058903.5A CN201410058903A CN104865624A CN 104865624 A CN104865624 A CN 104865624A CN 201410058903 A CN201410058903 A CN 201410058903A CN 104865624 A CN104865624 A CN 104865624A
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- 230000000694 effects Effects 0.000 claims abstract description 19
- 238000005282 brightening Methods 0.000 claims description 7
- 230000002146 bilateral effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 abstract description 47
- 230000000007 visual effect Effects 0.000 abstract description 4
- 239000012788 optical film Substances 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract 1
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 3
- 230000001154 acute effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001795 light effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001149 cognitive effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012769 display material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The present invention discloses a curved surface arc microstructural prism film, and aims to overcome the disadvantages that a conventional optical film applied to the panel display field is smaller in visual angle range, is not obvious in brightness increase effect, etc. The curved surface arc microstructural prism film comprises a microstructural prism cone containing a plurality of curved surface arcs, realizes the effects of expanding the visual angle of the prism film and increasing the brightness by designing the structural parameters, such as a V-groove height h of the 210 prism film, a 220 prism vertex angle curved surface arc peak radius r, a 230 prism cone bus included angle a,a 240 prism cone arc top center distance, etc., can be widely used in the panel display field, and enables the cost and energy consumption of a backlight module to be reduced.
Description
Technical field
The present invention relates to the backlight module optical thin film being applied to field of flat panel displays, particularly can be used for display blast and the prism film expanding view effect.
Background technology
Prism film is exactly the functional optical film of the utilization factor promoting light in backlight module panel.The guide-lighting process in inside of flat-panel monitor is the light " polarization " launched by back light, then converts polarized light to seen image.But these light are often wasted because of scattering in liquid-crystal apparatus, make overall brightness cannot reach expection brightness.And the light that these can slattern by prism film, spectators direction of again leading, promotes the brightness of liquid-crystal apparatus, and the light that Polarizer can also be absorbed in addition reclaims, and promotes the brightness of liquid-crystal apparatus further.In brief, prism film focuses on the light of original dispersion in a certain angular range centered by normal, and the brightness at Shi Zhou center increases greatly.
The principle of work of prism film can represent with Fig. 1.In the drawings, the light entering prism film is divided three classes by prism film:
The first kind is direct emergent ray 110; These light 110 incide in prism facets after being reflected by prism bases.As incident angle is less than the angle of total reflection, they will from the direct outgoing of prism surface.Because have the angle of inclination of prism side and incident angle to be less than the restriction of the angle of total reflection, the light of outgoing can be distributed within the scope of about 70 degree.
Equations of The Second Kind is back into backlight source 120; Such light 120 meets total reflection condition inciding the incident angle on prism surface.Time on the prism surface being reflected to opposite, if incident angle still meets total reflection condition, light is just reflected back toward backlight.These light being reflected back toward backlight again through diffusion sheet, can enter light guide plate again by end reflectors reflects, and then get back to light guide plate, pass through diffusion sheet again, at this moment light is broken up completely, after entering prism film again, is divided into again three lightlike lines and selects.
After 3rd lightlike line is totally reflected once by prism surface, when arriving opposite prism surface, do not meet the light 130 of total reflection condition.These light 130 major parts can enter contiguous prism and then be totally reflected there, return backlight.The light that sub-fraction angle changing rate is large in addition can not enter contiguous prism, and these light finally can be lost.
At present, what the structure relating to prism film in existing technology adopted substantially is wedge angle planar structure, the prism film technical characteristics related to as Shenzhen Innocom Technology Co., Ltd. CN1982918 is the refractive index controlling each layer, thus can reach the polarization effect identical with common two-layer prism film.The micro-prism structure that Youda Photoelectric Co., Ltd CN1658047 proposes, technical characteristics is structure adopts an agent structure and a micro-prism structure, cellular construction is three-in-one, every unit is totally three prism structures, middle one is the right-angle triangle of isosceles, drift angle is right angle, and 2 adjacent prism structures are also isosceles triangles, and just its right angle is adjacent with 2 acute angles of middle isosceles triangle.The structure of this multiple upwards vertical plane it is said the light leakage phenomena that effectively can reduce backlight module, and the shooting angle simultaneously reducing light improves the utilization factor of light.General Electric Co. Limited CN1720469 proposes a kind of micro-prism structure of bottom bend, and its fundamental purpose also improves the phenomenon of light leak with great visual angle.Although these structural designs are provided with very large improvement in light leak, still do not solve viewing angle problem, simultaneously also for the effect that the luminance raising of display material does not also significantly promote.
Summary of the invention
The object of the invention is to overcome the shortcoming existed in prior art, a kind of optical prism film expanding visual angle and increase brightness is provided.
For realizing above-mentioned goal of the invention, the present invention is realized by subordinate's technical scheme:
A kind of prism film of cambered microstructure, is characterized in that the microstructured prisms cone comprising several curved surface arc, forms the prism film surface with brightening effect.
Described prism film of cambered microstructure, is characterized in that described microstructured prisms cone presents curved surface arcuate structure, and arranges at the surface uniform of prism film.
Described prism film of cambered microstructure, is characterized in that described curved surface arc is for semicircle or half elliptic.
Described microstructured prisms film, is characterized in that described microstructured prisms cone height is between 20 ~ 60um.
Described microstructured prisms film, is characterized in that the distance between described microstructured prisms cone arbitrary arc top central point and another arc top central point is 30 ~ 50um.
Described microstructured prisms film, is characterized in that the bilateral angle of described microstructured prisms cone is between 70 ~ 120 degree.
Described microstructured prisms film, is characterized in that the peak radius 2 ~ 6um on the Curved arc top of described microstructured prisms cone.
Described microstructured prisms film, is characterized in that the material refraction index of described prism film is between 1.50 ~ 1.59.
The advantage of microstructured prisms film involved in the present invention is:
1, becomed privileged by angle configuration, effectively eliminate the ubiquitous moire problem of liquid crystal display, add brightness;
Moire refers to when show image, the picture local produced or comprehensively non-uniform phenomenon.The simplest determination methods is switched to black picture and other low grey menu exactly in darkroom, and then firmly go from various different angle, liquid crystal display just has moire miscellaneous.The existence of moire have impact on liquid crystal display effect.Prism film involved in the present invention, is different from conventional prism film, can effectively eliminate optical interference phenomenon.By preventing interference figure, reduce the inequality of brightness.So moire can not only be reduced, but also can by maximum for brightness raising 20%.
2, angular field of view is expanded;
In expansion angular field of view, can by conventional prism film ± 45 ° of angulars field of view expand to ± 60 °.
Accompanying drawing explanation
Fig. 1: the principle of work of prism film
Fig. 2: a kind of structural representation of prism film of cambered microstructure
Embodiment
For further cognitive and understanding can be had to feature of the present invention, object and function, illustrated case is now coordinated to explain.
Please refer to Fig. 2, Fig. 2 is prism film of cambered microstructure structural drawing of the present invention, and major parameter involved in this structural drawing is V groove height h, 220 prism vertex angle curved surface arc peak radius r, 230 prism centrum bus angle a, the 240 prism centrum arc top centre distance of 210 prism films.
The brightening effect of analysing prism film, mainly should see the uniformity coefficient of the degree that light is gathered to center by it and outgoing, is compared by the parameter of two below:
The comparison of a, homogeneity
Assuming that the gray-scale value of the most high pixel point of brightness is 255, whether this parameter characterization prism film various piece beam projecting is even, if result fluctuation will cause very greatly the brightness uniformity of exit image poor, image can not clearly show.This parameter characterization blast homogeneity of prism film.
The comparison of b, brightness
This parameter characterization brightness size of vision blast.
Following examples are when doing structural design; those skilled in the art adopts binary optical principle to implement the simulation of brightening effect the structural parameters of prism film; embodiment is including but not limited to following examples, and the organization plan that thinking according to the present invention filters out is protection scope of the present invention.
Embodiment 1
By only changing the V groove height h of 210 prism films, other characteristic parameters are constant, analyze its impact effect.
The V groove height h change of table 1 prism film affects prism film brightening effect
| h(μm) | L max | L min | L eve | U max | U min | Fluctuating range |
| 20 | 39.0％ | 38.3％ | 38.65％ | 255 | 253 | 0.78％ |
| 25 | 40.8％ | 39.6％ | 40.2％ | 255 | 250 | 1.96％ |
| 50 | 42.5％ | 40.8％ | 41.65％ | 255 | 249 | 2.35％ |
| 100 | 42.8％ | 41.6％ | 42.2％ | 255 | 238 | 6.67％ |
| 150 | 48.6％ | 46.9％ | 47.75％ | 255 | 229 | 10.19％ |
Comparative result shows the increase along with h, and brightness maxima becomes large, minimum value diminishes, mean value slightly increases, but homogeneity worse and worse.So the V groove height h of 210 prism films changes little to the whole structure effect of holding together light; But in order to ensure the display effect of liquid crystal entirety, avoiding light and shade uneven, promoting surface brightness even.In general, during h≤50um, the fluctuation range of brightness is less, thus obtains good uniformity coefficient.
Embodiment 2
By changing 220 prism vertex angle curved surface arc peak radius r, other characteristic parameters are constant, analyze its impact effect.
The radius r change of table 2 prism vertex angle curved surface arc peak affects prism film brightening effect
| r(um) | L max | L min | L eve | U max | U min | Fluctuating range |
| 2 | 19.0％ | 17.3％ | 18.15％ | 255 | 252 | 1.17％ |
| 3 | 20.0％ | 18.7％ | 19.35％ | 255 | 250 | 1.96％ |
| 4 | 21.6％ | 19.8％ | 20.7％ | 255 | 251 | 1.57％ |
| 5 | 26.5％ | 25.7％ | 26.1％ | 255 | 249 | 2.35％ |
| 6 | 28.8％ | 27.8％ | 28.3％ | 255 | 248 | 2.74％ |
| 7 | 28.0％ | 26.9％ | 27.4％ | 255 | 246 | 3.53％ |
Can find out from upper table, after from 2um, brightness increases along with 220 prism vertex angle curved surface arc peak radius r and increases, when 6um to hold together light effect best, after 6um, brightness starts to decline; Fluctuating range has the trend of increase along with the increase of angle, but the changes in amplitude of fluctuation is little.This shows, prism vertex angle curved surface arc peak radius r can be selected between 2 ~ 6um.
Embodiment 3
By only changing 230 prism centrum bus angle a, other characteristic parameters are constant, analyze its impact effect.
Table 3 prism centrum bus angle a change affects prism film brightening effect
| A (unit degree) | L max | L min | L eve | U max | U min | Fluctuating range |
| 70 | 29.0％ | 27.3％ | 28.15％ | 255 | 250 | 1.96％ |
| 80 | 30.0％ | 28.7％ | 29.35％ | 255 | 249 | 2.35％ |
| 90 | 41.8％ | 39.9％ | 40.85％ | 255 | 253 | 0.78％ |
| 100 | 46.5％ | 45.8％ | 46.15％ | 255 | 248 | 2.74％ |
| 110 | 48.8％ | 47.6％ | 48.2％ | 255 | 246 | 3.53％ |
| 120 | 48.6％ | 47.0％ | 57.8％ | 255 | 240 | 5.88％ |
Can find out from upper table, after from 70 degree, brightness increases along with the increase of 230 prism centrum bus angle a, when 120 degree to hold together light effect best, after 110 degree, brightness start to decline; Fluctuating range has the trend of increase along with the increase of angle, this shows, the light gathering of 230 prism centrum bus angle a to prism film has conclusive effect, obtuse angle brightness is apparently higher than acute angle, but obtuse angle, fluctuating range aspect increases to some extent, can be regulated by the height reducing prism.
Claims (8)
1. a prism film of cambered microstructure, is characterized in that the microstructured prisms cone comprising several curved surface arc, forms the prism film surface with brightening effect.
2. prism film of cambered microstructure according to claim 1, is characterized in that described microstructured prisms cone presents curved surface arcuate structure, and arranges at the surface uniform of prism film.
3. prism film of cambered microstructure according to claim 2, is characterized in that described curved surface arc is for semicircle or half elliptic.
4. microstructured prisms film according to claim 2, is characterized in that described microstructured prisms cone height is between 20 ~ 60um.
5. microstructured prisms film according to claim 2, is characterized in that the distance between described microstructured prisms cone arbitrary arc top central point and another arc top central point is 30 ~ 50um.
6. microstructured prisms film according to claim 2, is characterized in that the bilateral angle of described microstructured prisms cone is between 70 ~ 120 degree.
7. microstructured prisms film according to claim 2, is characterized in that the peak radius 2 ~ 6um on the Curved arc top of described microstructured prisms cone.
8. microstructured prisms film according to claims 1 to 7, is characterized in that the material refraction index of described prism film is between 1.50 ~ 1.59.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410058903.5A CN104865624A (en) | 2014-02-21 | 2014-02-21 | Curved surface arc microstructural prism film |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410058903.5A CN104865624A (en) | 2014-02-21 | 2014-02-21 | Curved surface arc microstructural prism film |
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| CN104865624A true CN104865624A (en) | 2015-08-26 |
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| CN201410058903.5A Pending CN104865624A (en) | 2014-02-21 | 2014-02-21 | Curved surface arc microstructural prism film |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319626A (en) * | 2015-11-09 | 2016-02-10 | 张家港康得新光电材料有限公司 | Optical film and display device |
| TWI639871B (en) * | 2016-05-16 | 2018-11-01 | 惠和股份有限公司 | Optical sheet for liquid crystal display device, backlight unit for liquid crystal display device and production method of optical sheet for liquid crystal display device |
| US10386567B2 (en) | 2016-05-16 | 2019-08-20 | Keiwa Inc. | Optical sheet for liquid crystal display device, backlight unit for liquid crystal display device and production method of optical sheet for liquid crystal display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101021574A (en) * | 2006-09-22 | 2007-08-22 | 长兴光学材料（苏州）有限公司 | Optical film and two-dimensional display device |
| CN201434914Y (en) * | 2009-05-26 | 2010-03-31 | 光耀科技股份有限公司 | Mixed light focusing sheet |
| CN102141638A (en) * | 2011-04-02 | 2011-08-03 | 袁帅 | Prism film of cambered microstructure |
-
2014
- 2014-02-21 CN CN201410058903.5A patent/CN104865624A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101021574A (en) * | 2006-09-22 | 2007-08-22 | 长兴光学材料（苏州）有限公司 | Optical film and two-dimensional display device |
| CN201434914Y (en) * | 2009-05-26 | 2010-03-31 | 光耀科技股份有限公司 | Mixed light focusing sheet |
| CN102141638A (en) * | 2011-04-02 | 2011-08-03 | 袁帅 | Prism film of cambered microstructure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319626A (en) * | 2015-11-09 | 2016-02-10 | 张家港康得新光电材料有限公司 | Optical film and display device |
| TWI639871B (en) * | 2016-05-16 | 2018-11-01 | 惠和股份有限公司 | Optical sheet for liquid crystal display device, backlight unit for liquid crystal display device and production method of optical sheet for liquid crystal display device |
| US10386567B2 (en) | 2016-05-16 | 2019-08-20 | Keiwa Inc. | Optical sheet for liquid crystal display device, backlight unit for liquid crystal display device and production method of optical sheet for liquid crystal display device |
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