CN103244875B - Display backlight structure with nano metal grating - Google Patents
Display backlight structure with nano metal grating Download PDFInfo
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- CN103244875B CN103244875B CN201310209438.6A CN201310209438A CN103244875B CN 103244875 B CN103244875 B CN 103244875B CN 201310209438 A CN201310209438 A CN 201310209438A CN 103244875 B CN103244875 B CN 103244875B
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Abstract
The invention discloses a display backlight structure with a nano metal grating, which comprises a light source, a lamp tube reflection cover, a reflection sheet, a light guide plate, a diffusion sheet, and the nano metal wire grating arranged between the diffusion sheet and a polaroid on the bottom layer of a liquid crystal panel, wherein the nano metal grating consists of a grating face, a baseplate and a substrate face; the baseplate is located between the grating face and the substrate face; the grating face is over against the diffusion sheet; and the substrate face faces towards the polaroid. The display backlight structure has higher optical efficiency than the ordinary structure of which the substrate face is close to backlight, and can solve the problem in a visual angle of viewing the liquid crystal panel, and the reflection backlight can be recycled with the adoption of the nano metal grating, so that display luminance can be improved greatly, and the energy can be saved.
Description
Technical field
The present invention relates to technical field of information display, specifically relate to a kind of backing structure containing nano metal wiregrating to improve screen display brightness.
Background technology
In flat display field, LCD occupies the share of more than 80%, and LCD itself does not have a characteristics of luminescence, and therefore, the light source that must provide by backlight module and the brightness be evenly distributed just can make liquid crystal display show image.Therefore bright enhancement film, light guide plate, diffusion barrier etc. are also referred to as backlight module key component, and its Main Function provides uniform area source for liquid crystal panel, light-transmissive characteristic high as far as possible, do not affect the characteristic of light as far as possible.As shown in Figure 1, very low to the effective light output efficiency exporting light from backlight, the display brightness of screen is lower for the structure of the backlight module of common LCD.
At present for above problem, improve screen display brightness method to mainly contain: (1) adds brightness enhancement film in backlight module, wherein especially produce dual brightness enhancement film (or being called DBEF film) with Minnesota Mining and Manufacturing Company the most common, this film is by the optical thin film with generation Efficient polarization light function of layer high molecule Material cladding; Specifically see the researcher of http://www.3M.com/vikuiti related introduction (2) U.S. and the photoelectricity business tie-up of one, Taiwan, the linear polarization element in LCD can be replaced with nanometer grating polarizer, produced thinner, more efficient display device.In first method, DBEF is a kind of reflective polarizers, by the light of selective reflecting back light system, make its not absorb by the lower polaroid of LCD, the part light at the full visual angle of LCD is re-used, simultaneously can recycle polarised light.Make axial brightness increase about 60% thus.But existing DBEF film causes the light revealed to be absorbed because polarization rejection ratio is low when being used for LCD display as polarisation egative film, and poor effect, only has the luminous energy of about 30% to improve.The second adopts nanometer grating polarizer to replace reflecting polarizer and bottom linear polarization layer, by the function i ntegration of these two polarizers is entered a backlight circulating element, thus improves display brightness.But do not mention the putting position problem of nanometer wiregrating in this approach, and this exactly has a great impact for the raising tool of display brightness.
Summary of the invention
The object of the invention is to for above-mentioned the deficiencies in the prior art, a kind of display backing structure with nano metal grating is provided, improve from light source to the effective light output efficiency exporting light.
Technical solution of the present invention is as follows:
A kind of display backing structure with nano metal grating, comprise light source, light tube reflection cover, reflector plate, light guide plate, diffusion sheet, its feature is also to comprise the nano metal wiregrating between the polarizer being arranged at diffusion sheet and liquid crystal panel bottom, this nano metal wiregrating is made up of grating face, substrate and substrate surface, described substrate is between grating face and substrate surface, grating face is just to diffusion sheet, and substrate surface is towards polaroid.
Described nano metal wiregrating is arranged on just maximum to the angle of emergence after diffusion sheet direction.
Described substrate is plastics to optical transparency or glass.
Described light source is cold cathode fluorescent tube (CCFL) or light emitting diode (LED).
Described light tube reflection cover acts on the light source encasing fluorescent tube and send, in the feeding light guide plate of trying one's best.
Described light guide plate is that line source is converted to area source, is used for improving the uniformity of gray scale and panel light, does not refer in particular to a certain class light guide plate.Can be tabular also can be wedge shape, the mode of printing of site can be IR or UV printing.
Described reflector plate enters in light conducting region again by the light source be not scattered reflection, and reflection mode is mirror-reflection, to improve the utilization rate of light.
There is a lot of granular object in described diffusion sheet, the light that light guide plate receives can be spread, light is propagated to nano metal wiregrating frontal, plays the effect of widening visual angle.
Described nano metal wiregrating just has grating in the one side of diffusion sheet, and is coated with metal above, and does not have grating towards the side of polarizer.
Described substrate is transparent plastic or glass.
The grating face of described nano metal wiregrating is coated with metal, and described metal is Al or Ag, the restriction and its thickness does not fix.The metal used in present embodiment is Al, and its thickness is 50nm.
Described grating face is the nested structure of the defective lines of tool or microcavity, is single-layer metal wiregrating or double-level-metal wiregrating, the restriction that its cycle does not fix.The grating used in the present embodiment is the double-level-metal wiregrating cycle is 300nm, and the degree of depth of wiregrating is 80nm.
Described nano metal wiregrating is placed on the length direction of just maximum to the angle of emergence after diffusion sheet direction and common light guide plate.Can avoid, because incident light is by optical grating diffraction or form the resonance of horizontal light wave and the absorption that causes increases, brightness and color being changed with visual angle.
The placement location of nano metal wiregrating is particularly pointed out: its grating face is just to diffusion sheet in said structure, non-grating face is then towards polarizer, and nano metal wiregrating is placed in just maximum to the angle of emergence after diffusion sheet direction, make backlight first through wiregrating again from substrate transmission mode out.Its principle is that can reduce incident light is scattered and is coupled to substrate formation absorption loss, larger reflection efficiency can be obtained when transmission is identical, reach the optical efficiency more increased near backlight than general substrate surface, therefore, it is possible to greatly improve brightness and the economize energy of display.The present invention also points out through light guide plate, line source to be converted into area source when LED light source simultaneously, the light received by light guide plate by diffusion sheet again carries out diffusion when carrying out widening visual angle, is placed in by nano metal wiregrating on the length direction of just maximum to the angle of emergence after diffusion sheet direction and common light guide plate.Can avoid due to incident light by optical grating diffraction or formed horizontal light wave resonance thus increase absorb, brightness and color is caused to change with visual angle, as bibliography: ZhichengYe, JunZheng, ShuSun, Shujing Chen and Dahe Liu, Plasmonics., 2012. DOI 10.1007/s11468-012-9433-6.
Compared with prior art, the invention has the beneficial effects as follows and improve from light source to the effective light output efficiency exporting light, reflection backlight can be realized recycle, on original basis, further can improve display brightness, and the viewing angle problem when watching liquid crystal panel can be ensured.Meanwhile, the use of nano metal wiregrating means that reflection backlight can recycle, thus greatly can improve brightness and the economize energy of display.
Accompanying drawing explanation
Fig. 1 is the structural representation of traditional backlight module and liquid crystal panel in prior art.
Fig. 2 is the structural representation that the present invention has the display backlight embodiment of nano metal grating.
Fig. 3 is after nano metal wiregrating is inverted by display backlight that the present invention has a nano metal grating, is used for doing the structural representation of the embodiment verified.
Fig. 4 is two kinds of embodiment output light intensity contrasts when same intensity backlight in the present invention.
Fig. 5 be in the present invention incident light along when changing perpendicular to grating line orientations, the light transmittance figure drawn.
Fig. 6 is the light transmittance figure that in the present invention, incident light draws when nano metal wiregrating line orientations changes.
In figure: 1-substrate, 2-grating face, 3-substrate surface, 4-diffusion sheet, 5-light guide plate, 6-reflector plate, 7-light tube reflection cover, 8-light source, 9-bottom polarizer, 10-liquid crystal layer, 11-colored filter, 12-top layer polarizer, 13-outermost reflector, 14-brightness enhancement film.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is elaborated, but should not limit the scope of the invention with this.
Please first consult Fig. 2, Fig. 2 is the first embodiment of display backlight that the present invention has nano metal grating.As shown in the figure, after light emitting diode 8 (LED) is lighted, linear light sources enters light guide plate 5 through reflector 7, transition lines distribution of light sources uniformly area source, through diffusion sheet 4, the light that light guide plate 5 is collected is spread again, the whole substrate 1 containing nano metal wiregrating is placed between the polarizer 9 of diffusion sheet and bottom, wherein nano metal wiregrating grating face 2 is just to diffusion sheet, 3, non-grating face is towards bottom polarizer 9, and nano metal wiregrating is placed in just maximum to the angle of emergence after diffusion sheet 4 direction.Wherein, bottom polarizer 9, liquid crystal layer 10, colored filter 11, top layer polarizer 12, outermost reflector 13 form liquid crystal panel.
Fig. 3 is that the present invention has the display backlight of nano metal grating by the embodiment after the inversion of nano metal wiregrating, is also used to bring with the embodiment in Fig. 2 compare, to prove a kind of embodiment of the superiority that the present invention has.As shown in the figure, to work as after light emitting diode (LED) lights, linear light sources enters light guide plate through reflector, transition lines distribution of light sources uniformly area source, the light collected by light guide plate through diffusion sheet again spreads, and is placed between diffusion sheet and the polarizer of bottom by the whole substrate 1 containing nano metal wiregrating.This substrate 1 is substrate surface 3 near the one side of diffusion sheet, in this substrate 1 towards the one side of bottom polarizer be grating face 2.
Fig. 4 is two kinds of embodiment output light intensity contrasts when same intensity light source in the present invention, as shown in the figure, in figure represented by black line is that the spectrum line come measured by spectrometer is just used in grating face namely under the first embodiment to backlight, and in figure represented by grey lines is that namely substrate surface just uses the spectrum line come measured by spectrometer under the second embodiment to backlight.The wherein wavelength of the light wave of abscissa representative, unit is nanometer.Ordinate then represents the final intensity exporting light.Embodiment described in Fig. 2 can obtain optical utilization efficiency more efficient than embodiment described in Fig. 3 when transmission is identical as seen from Figure 4.This can reduce incident light mainly due to grating facing to light source placement and be scattered and be coupled to substrate formation absorption loss, therefore when transmission is identical, can obtain larger reflection efficiency, can improve optical utilization efficiency whereby.So preferred grating face is just to backlight.
Fig. 5 and Fig. 6 is the resolution chart that the transmitted spectrum of nano metal wiregrating in the present invention moves towards with incident light and grating lines, and abscissa is wavelength, and unit is nanometer, and ordinate is projection ratio, and unit is %.Wherein Fig. 5 is that incident angle is along the light transmittance figure drawn when changing perpendicular to grating line orientations.Fig. 6 is the light transmittance figure of incident light when changing along nano metal wiregrating line orientations.Discovery clearly can be produced horizontal light wave resonance clearly thus the color of transmitted spectrum is changed in the modes of emplacement of Fig. 6 by Fig. 5 and 6 contrast, efficiency of transmission reduces simultaneously.Therefore the grating line orientations of prioritizing selection nano metal grating is consistent with the maximum dispersal direction through light guide plate emergent light.
Claims (6)
1. one kind has the display backing structure of nano metal grating, comprise light source (8), light tube reflection cover (7), reflector plate (6), light guide plate (5), diffusion sheet (4), characterized by further comprising the nano metal wiregrating between the polarizer being arranged at diffusion sheet and liquid crystal panel bottom, this nano metal wiregrating is by grating face (2), substrate (1) and substrate surface (3) are formed, described substrate (1) is positioned between grating face (2) and substrate surface (3), grating face (2) is just to diffusion sheet, substrate surface (3) is towards polaroid, described nano metal wiregrating is arranged on just maximum to the angle of emergence after diffusion sheet direction.
2. the display backing structure with nano metal grating according to claim 1, is characterized in that,
The grating face (2) of described nano metal wiregrating is coated with metal.
3. the display backing structure with nano metal grating according to claim 2, is characterized in that,
Described metal is Al or Ag.
4. the display backing structure with nano metal grating according to claim 1, is characterized in that,
Described substrate (1) is plastics to optical transparency or glass.
5. the display backing structure with nano metal grating according to claim 1, is characterized in that,
Described grating face (2) is the nested structure of the defective lines of tool or microcavity.
6. the display backing structure with nano metal grating according to claim 5, is characterized in that,
Described grating face (2) is single-layer metal wiregrating or double-level-metal wiregrating.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104516164B (en) | 2015-01-05 | 2018-03-09 | 京东方科技集团股份有限公司 | A kind of display base plate and preparation method thereof and display device |
| CN110441854B (en) * | 2015-05-29 | 2021-12-21 | 富士胶片株式会社 | Backlight unit |
| JP6710957B2 (en) * | 2015-12-17 | 2020-06-17 | 大日本印刷株式会社 | Image source unit and display device |
| CN105572959B (en) | 2016-03-01 | 2019-03-15 | 京东方科技集团股份有限公司 | A kind of liquid crystal display panel and display device |
| CN105700226A (en) * | 2016-04-25 | 2016-06-22 | 京东方科技集团股份有限公司 | Viewing angle control mechanism, light guide plate, backlight module, array substrate and display panel |
| KR102494859B1 (en) * | 2016-05-26 | 2023-02-02 | 삼성디스플레이 주식회사 | Display device and manufacturing method thereof |
| CN108152877A (en) * | 2017-12-29 | 2018-06-12 | 深圳市华星光电技术有限公司 | Wire grating polaroid and preparation method thereof, liquid crystal display |
| CN109375419B (en) * | 2018-10-29 | 2021-11-05 | 京东方科技集团股份有限公司 | Backlight module and display device |
| 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 |
| CN112379550B (en) * | 2020-11-13 | 2023-01-24 | 昆山龙腾光电股份有限公司 | Display panel, driving method and display device |
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| WO2006011268A1 (en) * | 2004-07-23 | 2006-02-02 | Hitachi Chemical Co., Ltd. | Diffraction type condensing film and surface light source device using the same |
| US7351346B2 (en) * | 2004-11-30 | 2008-04-01 | Agoura Technologies, Inc. | Non-photolithographic method for forming a wire grid polarizer for optical and infrared wavelengths |
| KR100938118B1 (en) * | 2007-09-07 | 2010-01-22 | 미래나노텍(주) | A light sheet unit including nano wire grid and backlight assembly employing the same |
| US8310621B2 (en) * | 2008-02-13 | 2012-11-13 | Sharp Kabushiki Kaisha | Illumination device and liquid crystal display device |
| JP2011248284A (en) * | 2010-05-31 | 2011-12-08 | Sony Chemical & Information Device Corp | Polarizing plate and method of manufacturing the same |
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