CN101699152B - Two-dimensional metallic photonic crystal-based light guide plate with polarization function - Google Patents
Two-dimensional metallic photonic crystal-based light guide plate with polarization function Download PDFInfo
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- CN101699152B CN101699152B CN2009103097845A CN200910309784A CN101699152B CN 101699152 B CN101699152 B CN 101699152B CN 2009103097845 A CN2009103097845 A CN 2009103097845A CN 200910309784 A CN200910309784 A CN 200910309784A CN 101699152 B CN101699152 B CN 101699152B
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Abstract
The invention discloses a two-dimensional metallic photonic crystal-based light guide plate with a polarization function, which comprises a light guide plate substrate, a metallic photonic array, a metal layer and a one-dimensional grating, wherein the metallic photonic array is positioned on a light emitting surface of the light guide substrate; the metal layer and the one-dimensional grating are respectively positioned on the bottom surface of the light guide substrate opposite to the light emitting surface; and an light incidence surface and a side surface are positioned between the light emitting surface and the bottom surface of the light guide substrate respectively. Because a transmission type metal grating and a reflection type metal grating are directly manufactured on the light guide plate, the structure of a backlight system is simplified and the thickness of backlight is reduced; and a two-dimensional transmission type grating can regulate light-emitting performance in two directions, so the design flexibility is increased.
Description
Technical field
What the present invention relates to is a kind of device of technical field of liquid crystal display, specifically is a kind of LGP of the band polarization function based on two-dimensional metallic photonic crystal.
Background technology
The principle of thin film transistor (TFT)-liquid crystal display (TFT-LCD) is to utilize liquid crystal to form polarised light to control whether passing through of light.The structure of the major part of traditional TFT-LCD panel comprises several most of compositions such as sandwiching liquid crystal, module backlight.Wherein sandwiching liquid crystal comprises polarizer, glass plate, groove shape surface, liquid crystal layer, colored filter of former and later two quadratures etc., its principle is by apply voltage on liquid crystal layer, control is the polarization state of the light of polarizer outgoing in the past, thereby control reaches Presentation Function from the amount of light size of rear polarizer.The effect of module backlight is to provide the area source that brightness is abundant and be evenly distributed to liquid crystal panel, and it comprises light source, reflecting plate, LGP, optical diffusion and prism anti-reflection film.Traditional TFT-LCD panel exists some significantly not enough: the one, and the traditional absorption-type polarizer that produces linear polarization can cause nearly 1/2 optical absorption loss; The 2nd, need multiple devices such as optical diffusion and prism anti-reflection film for the outgoing light homogeneity that increases module backlight, increased the thickness and the cost of panel.
Find through literature search prior art, american documentation literature US007252424B2, put down in writing a kind of " BACKLIGHT MODULE CAPABLE OF INTERCHANGINGPOLARIZED STATES OF LIGHT " (backlight module with polarization function), wherein backing structure comprises: blooming, submicron grating layer, LGP, micro-structural, phase delay chip, reflecting layer.In this patent, its submicron grating can make the reflection of TE polarised light, TM polarised light see through; Phase delay chip and reflecting layer can make the polarization of light and the direction of propagation change.A kind of like this structure can make the non-linear polarization light in the light source obtain repeatedly recycling in LGP, and finally with the outgoing of TM linearly polarized light, improved optical efficiency, and the use of sheet partially before in the minimizing liquid crystal panel, but, the complex structure of this technology, film layer structure is more, and the one dimension submicron grating can only be regulated and control in one direction.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of LGP of the band polarization function based on two-dimensional metallic photonic crystal is provided, directly on LGP, make transmission-type and reflective contact metal grating, simplified the structure of back light system, reduced thickness backlight, and two-dimentional transmission-type grating can adjust optical property from both direction, has increased the flexibility of design.
The present invention is achieved by the following technical solutions, the present invention includes: LGP matrix, metal photon array, metal level and one-dimensional grating, wherein: metal photon array can be positioned at the exiting surface of LGP matrix, metal level and one-dimensional grating lay respectively on the LGP matrix and the exiting surface opposed bottom surface, are respectively incidence surface and side between the exiting surface of LGP matrix and the bottom surface.
Each lattice point of described metal photon array is a transmission-type two-dimensional metallic photonic crystal unit, and metal photon array covers whole exiting surface.
Described lattice point is circle or polygonized structure, and the height of lattice point is 2 μ m-200 μ m.
Described lattice point is preferably rectangle, lattice point increases progressively with Bessel function perpendicular to the lattice point length of side on the incidence surface direction, in the lattice point length of side unanimity that is parallel on the incidence surface direction, makes that like this close to sources place lattice point area is little, place, distance light source lattice point area is big, reaches the emitting uniform effect.
Be provided with two-dimensional projections formula metal photonic crystal in the described lattice point, the two-dimensional metallic photonic crystal of all lattice points is parallel to each other on crystal lattice orientation.
Described two-dimensional metallic photonic crystal is that parallelogram lattice and the light that only allows special polarization state are from the exiting surface outgoing, this two-dimensional metallic photonic crystal comprises two lattice period, being respectively with the incident lattice period a of light source vertical direction is that 10nm-200nm and perpendicular vertical lattice period b are 20nm-1000nm, wherein b/a＞2.
Described two-dimensional metallic photonic crystal is that gold, silver or aluminium are made, and it highly is 10-500nm.
The reflection-type one-dimensional grating that described one-dimensional grating is made for the acryl material, its outer surface is provided with metal level, and this metal level is gold, silver or the aluminium of 50nm-200nm.
The cycle of described one-dimensional grating is 10nm-250nm, highly is 0.05 μ m-10 μ m, and its crystal lattice orientation becomes 40-55 ° with the crystal lattice orientation of two-dimensional metallic photonic crystal.
The side of described LGP matrix is provided with reflectivity greater than 98% reflecting layer.
Be compared with the prior art, advantage of the present invention is: this polarization LGP not only can make the even outgoing of light, can also have the polarizer function simultaneously, compares traditional TFT-LCD, and the utilization rate that can improve light source effectively can increase by 1 times in theory.Simultaneously can save optical diffusion and prism anti-reflection film, improve the integrated level of panel device greatly, reduce the thickness and the cost of panel.Two the basic vector directions of 2 D photon crystal that adopt all have diffracting power, therefore can control the uniformity of bright dipping.This polarization light conducting plate structure is not only applicable to the side-light type light source, and directly-down light source is suitable for too.
Description of drawings
Fig. 1 is an embodiment polarization LGP generalized section.
Fig. 2 is an embodiment polarization LGP schematic top plan view.
Fig. 3 is the 2 D photon crystal schematic diagram of a subelement of embodiment.
Fig. 4 is an embodiment polarization bottom surface of light guide plate schematic diagram.
Fig. 5 is the signal of embodiment polarization LGP principle.
The specific embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As depicted in figs. 1 and 2, present embodiment comprises: LGP matrix 1, metal photon array 2, metal level 3 and one-dimensional grating 4, wherein: metal photon array 2 is positioned at the exiting surface 5 of LGP matrix 1, metal level 3 and one-dimensional grating 4 lay respectively on the LGP matrix 1 and exiting surface 5 opposed bottom surface 6, are respectively incidence surface 7 and side 8 between the exiting surface 5 of LGP matrix 1 and the bottom surface 6.
Described metal photon array 2 covers whole exiting surface 5, and the lattice point 9 of each rectangle is a transmission-type two-dimensional metallic photonic crystal 10.Lattice point 9 sizes in the regularity of distribution on the exiting surface 5 are: increasing progressively by the Bessel function distribution perpendicular to the lattice point length of side on the direction of incidence surface 7, the lattice point length of side unanimity on the direction that is parallel to incidence surface 7 remains unchanged.
Described lattice point 9 is a rectangular configuration, and the height of lattice point 9 is 100 μ m.
As shown in Figure 3, be provided with two-dimensional metallic photonic crystal 10 in the described lattice point 9, the two-dimensional metallic photonic crystal 10 of all lattice points 9 is parallel to each other on crystal lattice orientation.
Described two-dimensional metallic photonic crystal 10 for parallelogram lattice and the light that only allows special polarization state from exiting surface 5 outgoing, this two-dimensional metallic photonic crystal comprises two lattice period, being respectively with the incident lattice period a of light source vertical direction is that 100nm and perpendicular vertical lattice period b are 400nm, for guaranteeing 10 light transmission exiting surface 5 outgoing that allow special polarization state of two-dimensional metallic photonic crystal, (b/a)＞2, can guarantee that like this a has different effective refractive indexs with the b direction, thereby have anisotropic characteristic.Can resonate by excitating surface plasma at LGP medium and metallic surface simultaneously, surface plasma body resonant vibration is different to the optically-coupled ability of different polarization states, only polarization state is had coupling and outgoing ability perpendicular to the light of incident lattice period a direction, polarization state is parallel to the bottom surface 6 of the light of incident lattice period a direction with the reflected back LGP.
The height of described two-dimensional metallic photonic crystal 10 is 250nm, and its material is a gold.
Described reflection-type one-dimensional grating 4 is positioned at the bottom surface 6 of LGP, will be from the linearly polarized light reflected back exiting surface 5 of exiting surface 5 reflected backs, simultaneously can change the polarization of incident light attitude again, make that the polarization state of light reflect back can half-twist or become circularly polarized light from linearly polarized light, from and can go out like this recycling optical efficiency that improves from exiting surface 5 transmissions.
As shown in Figure 4, the material of described reflection-type one-dimensional grating 4 is acryl (PMMA), has applied one deck gold at its outer surface.The crystal lattice orientation of the photonic crystal of the crystal lattice orientation of described reflection-type one-dimensional grating 4 and exiting surface 7 is at 45, this is because the excited surface plasma resonance can change the polarization of incident light attitude between metal and PMMA, and polarization conversion efficiency is the highest when incident light is spent azimuth incident with 45.
Described 4 cycles of reflection-type one-dimensional grating are 125nm, highly are 5 μ m, and the thickness of the metal of surface-coated is 100nm.
The side 8 of described LGP scribbles the material of high reflectance, and its reflectivity is greater than 98%.
The operation principle of this polarization LGP as shown in Figure 5.The polarized component luminous energy perpendicular to plane of incidence that the light source 11 of random polarization attitude sends passes through exiting surface 5 outgoing.Remaining polarization direction is parallel to the component reflected back bottom surface 6 of plane of incidence, the reflection-type one-dimensional grating of bottom surface 6 is converted to perpendicular to plane of incidence the polarization of reflected light attitude by surface plasma body resonant vibration again, from and can form emergent lights by exiting surface 5, so circulation, the utilization rate of raising light source.
Claims (9)
1. LGP based on the band polarization function of two-dimensional metallic photonic crystal, it is characterized in that, comprise: the LGP matrix, metal photon array, metal level and one-dimensional grating, wherein: metal photon array is positioned at the exiting surface of LGP matrix, metal level and one-dimensional grating lay respectively on the LGP matrix and the exiting surface opposed bottom surface, be respectively incidence surface and side between the exiting surface of LGP matrix and the bottom surface, it is characterized in that, each lattice point of described metal photon array is a transmission-type two-dimensional metallic photonic crystal unit, and metal photon array covers whole exiting surface, described two-dimensional metallic photonic crystal is the parallelogram lattice, this two-dimensional metallic photonic crystal comprises two lattice period, be respectively incident lattice period a=100nm and vertical lattice period b=400nm with the light source vertical direction, wherein b/a＞2.
2. the LGP of the band polarization function based on two-dimensional metallic photonic crystal according to claim 1 is characterized in that described lattice point is circle or polygonized structure, and the height of lattice point is 100 μ m.
3. the LGP of the band polarization function based on two-dimensional metallic photonic crystal according to claim 1 and 2, it is characterized in that, described lattice point is a rectangle, and lattice point increases progressively with Bessel function perpendicular to the lattice point length of side on the incidence surface direction, in the lattice point length of side unanimity that is parallel on the incidence surface direction.
4. the LGP of the band polarization function based on two-dimensional metallic photonic crystal according to claim 1, it is characterized in that, be provided with transmission-type two-dimensional metallic photonic crystal unit in the described lattice point, the transmission-type two-dimensional metallic photonic crystal unit of all lattice points is parallel to each other on crystal lattice orientation.
5. according to the LGP of claim 1 or 4 described band polarization functions based on two-dimensional metallic photonic crystal, it is characterized in that, described two-dimensional metallic photonic crystal, it highly is 250nm.
6. according to the LGP of claim 1 or 4 described band polarization functions based on two-dimensional metallic photonic crystal, it is characterized in that described two-dimensional metallic photonic crystal is that gold, silver or aluminium are made.
7. the LGP of the band polarization function based on two-dimensional metallic photonic crystal according to claim 1 is characterized in that, the reflection-type one-dimensional grating that described one-dimensional grating is made for the acryl material, and its outer surface is provided with the 100nm metal level.
8. according to the LGP of claim 1 or 7 described band polarization functions based on two-dimensional metallic photonic crystal, it is characterized in that the cycle of described one-dimensional grating is 125nm, highly is 5 μ m, and the crystal lattice orientation of its crystal lattice orientation and two-dimensional metallic photonic crystal is at 45.
9. the LGP of the band polarization function based on two-dimensional metallic photonic crystal according to claim 1 is characterized in that, the side of described LGP matrix is provided with reflectivity greater than 98% reflecting layer.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103268B (en) * | 2011-01-29 | 2012-12-19 | 西南交通大学 | Control method for surface plasma output polarization state |
| CN102588845B (en) * | 2012-03-07 | 2014-07-16 | 苏州大学 | Back lighting device and liquid crystal display device |
| WO2015165049A1 (en) * | 2014-04-29 | 2015-11-05 | 华为技术有限公司 | Method and apparatus for interconnection of optical waveguide layers |
| CN104375324A (en) * | 2014-11-17 | 2015-02-25 | 深圳市华星光电技术有限公司 | Backlight module and display with the same |
| CN106785905A (en) * | 2017-01-19 | 2017-05-31 | 桂林电子科技大学 | A kind of electrooptic modulator based on Prague phase-shifted grating |
| CN107315280B (en) * | 2017-07-28 | 2020-02-21 | 京东方科技集团股份有限公司 | Backlight module, manufacturing method thereof and display device |
| CN107505773B (en) * | 2017-09-26 | 2021-01-26 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN108957839B (en) * | 2018-08-09 | 2022-09-30 | 京东方科技集团股份有限公司 | Display device, display panel, color film substrate and color film |
| CN111708212A (en) * | 2020-06-23 | 2020-09-25 | 武汉华星光电技术有限公司 | Display panel and display device |
| CN113885252B (en) * | 2021-10-08 | 2024-01-05 | 武汉华星光电技术有限公司 | Backlight module and display device |
| CN115657370A (en) * | 2022-10-28 | 2023-01-31 | 北京京东方显示技术有限公司 | Backlight module and display device |
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| FR2882161A1 (en) * | 2005-02-11 | 2006-08-18 | Commissariat Energie Atomique | WAVEGUIDE MODULATOR AND ASSOCIATED MODULATION METHOD |
| CN101252407A (en) * | 2008-04-03 | 2008-08-27 | 上海交通大学 | Wave decomposing multiplexer based on two-dimension photon crystal |
| CN101666889A (en) * | 2009-10-15 | 2010-03-10 | 上海交通大学 | Photonic crystal light guide plate with polarization function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2882161A1 (en) * | 2005-02-11 | 2006-08-18 | Commissariat Energie Atomique | WAVEGUIDE MODULATOR AND ASSOCIATED MODULATION METHOD |
| CN101252407A (en) * | 2008-04-03 | 2008-08-27 | 上海交通大学 | Wave decomposing multiplexer based on two-dimension photon crystal |
| CN101666889A (en) * | 2009-10-15 | 2010-03-10 | 上海交通大学 | Photonic crystal light guide plate with polarization function |
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Effective date of registration: 20151218 Address after: Two road yasumine Huli District of Xiamen city in Fujian province 361015 No. 86 unit 316 Patentee after: XIAMEN WENANO PHOTOELECTRIC CO.,LTD. Address before: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee before: Shanghai Jiao Tong University |
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Address after: 361015 unit 316, No. 86, anling 2nd Road, Huli District, Xiamen City, Fujian Province Patentee after: Xiamen Weina Photoelectric Technology Co.,Ltd. Address before: 361015 unit 316, No. 86, anling 2nd Road, Huli District, Xiamen City, Fujian Province Patentee before: XIAMEN WENANO PHOTOELECTRIC CO.,LTD. |