CN101440919A - Side input type backlight module unit - Google Patents
Side input type backlight module unit Download PDFInfo
- Publication number
- CN101440919A CN101440919A CNA2008102072723A CN200810207272A CN101440919A CN 101440919 A CN101440919 A CN 101440919A CN A2008102072723 A CNA2008102072723 A CN A2008102072723A CN 200810207272 A CN200810207272 A CN 200810207272A CN 101440919 A CN101440919 A CN 101440919A
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- optical fiber
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Abstract
The invention relates to a side entrance back light module unit, comprising a light conducting plate for guiding the ray transmission direction and making the rays emit out evenly from the light emergence surface of the light conducting plate; a light source arranged at one side of the light conducting plate; wherein, light conducting plate is form by fixing a plurality of side luminous polymer optical fibres which are arranged at parallel, and each side luminous polymer optical fibre comprises a light input end face, an upper side face and a lower side face. The light input end face is corresponding to the light source. The provided side entrance back light module unit can effectively improve the optical efficiency and uniformity and reduce the thickness the back light module unit.
Description
Technical field
The present invention relates to a kind of module backlight, particularly relate to a kind of raising optical efficiency, reduce the side entrance back module of module thickness backlight.
Background technology
Traditional cathode ray tube (CRT) TV is substituted by LCD TV flat panel TVs such as (LCD-TV) gradually.Along with the continuous progress of semiconductor technology, lcd technology, what people lived and sample improving constantly, and large scale, LCD-TV ultra-thin and wide colour gamut are just becoming development trend at present.
Because liquid crystal panel itself is not luminous, needs backlight to provide light source just can reach display effect.Chang Yong light source was cold-cathode fluorescence lamp (CCFL) backlight in the past, but it has a series of shortcoming: the mechanical strength deficiency of the ultra-fine fluorescent tube of CCFL, and problem is very outstanding in the large screen television complete machine; The CCFL fluorescent tube uses three primary colors fluorescent powder to obtain white light, cooperates back color representation ability not good enough with color film; Fluorescent tube relies on the ultraviolet excited light-emitting of mercuryvapour, can bring environmental issue; Fluorescent tube adopts high-frequency and high-voltage to drive, and can bring electromagnetic radiation pollution.Therefore CCFL is replaced by light emitting diode (LED) backlight gradually at present.The LED-backlit source has lot of advantages: structure of whole solid state, and mechanical strength is good, and product structure is more reasonable, and is safer; Colored expressive ability is strong, and the colored ability in LED-backlit source can surpass 120% of NTSC standard, even higher; The LED-backlit source is no mercury light source, environmental protection; Low-voltage DC driven (3-5V) has been cancelled the high voltagehigh frequency drive circuit of cold-cathode lamp, has fundamentally eliminated electromagnetic interference and electromagnetic pollution that electromagnetic radiation causes; Life-span is long, can reach more than 60,000 hours; Switch time is short, can reach nanosecond or the like.But LED is a spot light, realize just obtaining even distribution backlight after a lot of LEDs of the even needs backlight of straight-down negative are arranged into two-dimensional array and reserve certain light mixing distance, and be to adopt side-light type module backlight so realize the mainstream technology of ultra-thin demonstration.
Adopt the side-light type light source than adopting straight-down negative to have more advantage.This is because the lighting system of the side-light type light mixing distance that (thickness direction) need be certain on the vertical panel direction unlike straight-down negative.Though side-light type also needs certain light mixing distance (producing bright dark alternate " firefly " effect otherwise can cause near the light source place), its mixed light direction is to be parallel on the panel direction, not increase module thickness.
Fig. 1 is an existing side-light type module schematic diagram backlight, see also Fig. 1, the side entrance back module of prior art, comprise LGP 12, diffusion sheet 13 and prismatic lens 14, LGP 12 comprises LGP incidence surface 121 and LGP exiting surface 122, LGP 12 sides are placed with cold-cathode lamp 11, and the light of cold-cathode lamp 11 changes into uniform surface light source by LGP.Its difficulty mainly is: 1) efficient of LGP is low; 2) large-size uniform is not good enough; 3) the ultra-thin light guide board cost is too high.The at present disclosed LED of utilization realizes that the modification method of side-light type slimming module backlight mainly contains following 3 kinds: 1) optimize light guide plate mesh point and arrange; 2) Gai Liang diffusion sheet---be etched with even or non-homogeneous site on diffusion sheet close to sources one side to reduce " firefly " effect; 3) premix ray machine system---at LGP incidence surface and the corresponding position of LED particle prism structure or groove structure are set.
Above method has only improved the optical efficiency of going into of the uniformity and LGP to a certain extent, can not solve because leaded light efficient is low and uniformity not good enough cause can't realize large-sized ultrathin typeization.
Summary of the invention
Technical problem to be solved by this invention provides a kind of side entrance back module, can effectively improve the optical efficiency and the uniformity, reduces module thickness backlight.
The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of side entrance back module, comprises LGP, and guiding light transmission direction makes light evenly be penetrated by the exiting surface of LGP; Light source is positioned over a side of described LGP; Wherein, described LGP is fixedly formed by the many lateral emitting polymer optical fibers that are arranged in parallel, and every lateral emitting polymer optical fiber comprises light inlet end face, upper side and downside, and the light inlet end face of described lateral emitting polymer optical fiber is corresponding with described light source.
Above-mentioned side entrance back module, wherein, described light source is a LED lamp bar, the corresponding lateral emitting polymer optical fiber of each LED.
Above-mentioned side entrance back module, wherein, the downside of described lateral emitting polymer optical fiber is coated with highly reflecting films.
Above-mentioned side entrance back module, wherein, described light source is arranged at the one-sided of LGP, and described lateral emitting polymer optical fiber is provided with reflectance coating away from an end of light source.
Above-mentioned side entrance back module, wherein, described light source is arranged at the one-sided of LGP, and described lateral emitting polymer optical fiber is provided with indentation, and described indentation spacing is along with the direction away from light source is successively decreased.
Above-mentioned side entrance back module, wherein, described light source is arranged at the bilateral of LGP, described lateral emitting polymer optical fiber is provided with indentation, described indentation spacing by two ends to the third side to successively decreasing.
Above-mentioned side entrance back module, wherein, described indentation is V-type shape, U type shape, side convex outer curve type shape or side inner concave curve type shape.
The present invention contrasts prior art following beneficial effect: side entrance back module provided by the invention, by lateral emitting polymer optical fiber (the Side-emitting Polymer Optical Fiber that many are arranged in parallel, SEPOF) the fixing LGP that forms, can effectively improve the optical efficiency and the uniformity, reduce module thickness backlight.Side entrance back module provided by the invention can be realized the slimming of large scale liquid crystal display unit.
Description of drawings
Fig. 1 is existing side entrance back module schematic diagram.
Fig. 2 is a side entrance back module schematic diagram of the present invention.
Fig. 3 is a single POF optical fiber structure schematic diagram among the present invention.
Fig. 4 is one-sided light source opposite side plating reflectance coating exemplary plot.
Fig. 5 is a bilateral light source exemplary plot.
Fig. 6 is one-sided light source POF upper side cutting exemplary plot.
Fig. 7 is a bilateral light source POF upper side cutting exemplary plot.
Among the figure:
11 cold-cathode lamps, 12 LGPs, 13 diffusion sheets
14 prismatic lenses, 21 light-emitting diode light bars, 22 POF fiber arrays
25 cuttings of 23 diffusion sheets, 24 prismatic lenses
121 LGP incidence surfaces, 122 LGP exiting surfaces, 211 light emitting diodes
212 printed circuit board (PCB)s, 221 POF light inlet end faces, 222 POF upper sides
223 POF downsides, 224 POF fibre cores, 225 POF coverings
226 reflectance coatings, 251 V-type grooves, 252 U type grooves
253 side male type grooves, 254 side inner concave shape grooves
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing and exemplary embodiments.
Fig. 2 is a side-light type of the present invention module schematic diagram backlight, and Fig. 3 is a single POF optical fiber structure schematic diagram among the present invention.
See also Fig. 2, side entrance back module module of the present invention, comprise LGP, diffusion sheet 23 and prismatic lens 24, LGP 22 comprises LGP incidence surface 121 and LGP exiting surface 122, LGP is other to be placed with light-emitting diode light bar 21, and the light of light-emitting diode light bar 21 changes into uniform surface light source by LGP.
Above-mentioned side entrance back module module adopts LED commonly used at present as by light source, can certainly use the CCFL fluorescent tube.Plurality of LEDs among the present invention equidistantly is fixed on the PCB substrate 212 by viscose agent or scolder, by the electric interconnected formation LED lamp bar 21 between lead-in wire bonding realization LED211 and the PCB substrate 212.The aluminium base FR4 of the employing good heat conductivity of PCB substrate 212, or adopt metal inner core printed circuit board (PCB) (MCPCB, Metal Core PCB) to strengthen heat radiation.LED211 place face coating highly reflective silverskin or tunica albuginea are to improve light utilization efficiency on PCB substrate 212.Wherein, light emitting diode 211 comprises yellow fluorescent powder LED, red green fluorescence powder LED, RGB three chip encapsulated LED.Light emitting diode 211 can be that the top is emitting led, also can be that the limit is emitting led; Can be one-sided light source, also can be the bilateral light source.
The POF fiber array 22 that above-mentioned side entrance back module module, many POF optical fiber that is arranged in parallel fixedly form is as LGP, and every POF optical fiber comprises POF light inlet end face 221, and POF light inlet end face 221 is corresponding with each light emitting diode 211.Wherein, POF fiber array 22 comprises the lateral emitting polymer optical fiber of many parallel placements.See also Fig. 3, every POF optical fiber comprises POF fibre core 224 and POF covering 225.Wherein, POF optical fiber can be single core POF, also can be multicore POF; Can be gradual change (GI) type POF, also can be step (SI) type POF; Can be solid core POF, also can be liquid core POF, and wherein core material can be Merlon (PC), polymethyl methacrylate (PMMA), fluoroplastics etc. admittedly, and clad material can be fluoroplastics, silicones etc.Please continue referring to Fig. 3, every POF optical fiber comprises POF upper side 222 and POF downside 223, concentrates on 222 outgoing of POF upper side for making light energy, can apply highly reflecting films at POF downside 223.In addition, POF array 22 needs fixture, can be the box-like fixture of an integral body, also can be the strip fixture (so that the optical fiber spacing is adjustable) of a plurality of separation, and its material can be the high plastics of transparency, as PMMA.
Embodiment one
Fig. 4 is one-sided light source opposite side plating reflectance coating exemplary plot.
Please refer to Fig. 4, the side-light type module backlight with lateral emitting POF array light guide structure comprises light-emitting diode light bar 21 (on the plurality of LEDs 211 equally spaced PCB of the being fixed on substrates 212), lateral emitting polymer optical fiber array 22, diffusion sheet 23, prismatic lens 24.The light that LED lamp bar 21 sends enters fiber array through POF light inlet end face 221.Transmit via POF upper side 222 in the process that part light is propagated in optical fiber, form area source.Adopt one-sided led light source in this example, and plate the silverskin of high reflectance at POF opposite side end face.By light in the be reflected reflection of film of fiber end face, the light path that doubles, improving optical fiber side transmitted light quantity increases simultaneously along the luminous uniformity of optical fiber surface.
Embodiment two
Fig. 5 is a bilateral light source exemplary plot.
In order to improve POF side bright dipping non-uniform phenomenon, can adopt the bilateral light source.As shown in Figure 5, end face the plate reflectance coating of optical fiber among the embodiment one away from light source one side removed, also use a light-emitting diode light bar 21 in this side simultaneously, become the bilateral light source.Other conditions are all with example one.The bilateral light source can increase module briliancy backlight, improves the uneven phenomenon of one-sided light source POF side bright dipping, also can alleviate the heat radiation pressure in a sidelight source simultaneously.
Embodiment three
Fig. 6 is one-sided light source POF upper side cutting exemplary plot, and Fig. 7 is a bilateral light source POF upper side cutting exemplary plot.
Go out uniformity of light in order further to improve the POF side, please refer to Fig. 6 and Fig. 7, in 222 cuttings 25 of POF upper side, away from light source direction, the indentation spacing is successively decreased.For one-sided light source situation shown in Figure 6, the place apart from light source between cutting is intensive more; And for the situation of bilateral light source shown in Figure 7, the cutting spacing then is that the optical fiber two ends are more sparse, and the middle part comparatively dense can improve the uniformity of POF upper side bright dipping like this, thereby improves the optics uniformity of entire aphototropism mould.The cutting shape can be that the longitudinal section is a V-type 251, U type 252, and side convex outer curve type 253, side inner concave curve type 254 is along the rotary body of its central symmetry axis.Groove depth can be selected as required, but can not surpass the radius of whole optical fiber.Cutting should be with depth as shallow, and it is suitable that quantity mostly is.It is bright excessively that the part that can cause groove is deeply crossed in cutting, brings adverse effect.
From concrete optical parametric the beneficial effect that brings after the present invention adopts the lateral emitting polymer optical fiber as LGP is described below:
Spectrum and colour temperature: whole visible spectrum all is positioned at the low loss window of POF, and transmission spectrum is very smooth at visible-range.Be fit to very much the transmission visible light.More smooth at visible region because of the POF transmitted spectrum simultaneously, the colour temperature of LED emergent light after the POF transmission is also kept preferably.
Go into optical efficiency: POF core diameter 0.5-3mm, cladding diameter 3-15mm is optional, numerical aperture 0.5-0.9, maximum is gone into optic angle can reach 128 degree.The most models of existing commercial LED can match fully, consider that optical fiber light inlet end face has 4% reflection loss, and going into optical efficiency can be up to more than 96%.
Brightness: the brightness aspect depends primarily on the luminous total light flux of LED, goes into optical efficiency, the absorption loss of POF itself and the transmitance of lateral emitting.The company of states such as present Ou Ri has obtained important progress to the development of plastic optical fiber.The POF that they are developed into, the light proportion of goods damageds have dropped to 25～9dB/Km.(0.57-0.21% of one meter long only loss light energy of POF) only has 0.57-0.21% for every meter because of the optical absorption loss of optical fiber itself.Go into optical efficiency as described above up to 96%, and the transmitance of lateral emitting can artificially be regulated by processing technology, so as long as the luminous flux of LED is enough, brightness just can be guaranteed.
The uniformity: can adopt bilateral light source or one-sided light source other end plating total reflection film to increase the luminous uniformity of side.Can carry out indentation (fluting) by length to optical fiber in addition and handle, the edge is away from light source direction, and the indentation spacing is successively decreased.
In sum, side entrance back module provided by the invention under the situation that does not change other components of module backlight, uses the fiber array structure as LGP, can effectively improve the optical efficiency and the uniformity, reduces module thickness backlight.Side entrance back module provided by the invention because the diameter dimension of fiber array structure is very little, can be realized the slimming of large scale liquid crystal display unit.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (8)
1, a kind of side entrance back module comprises:
LGP, guiding light transmission direction makes light evenly be penetrated by the exiting surface of LGP;
Light source is positioned over a side of described LGP;
It is characterized in that, described LGP is fixedly formed by the many lateral emitting polymer optical fibers that are arranged in parallel, every lateral emitting polymer optical fiber comprises light inlet end face, upper side and downside, and the light inlet end face of described lateral emitting polymer optical fiber is corresponding with described light source.
2, side entrance back module according to claim 1 is characterized in that, described light source is a LED lamp bar, the corresponding lateral emitting polymer optical fiber of each LED.
3, side entrance back module according to claim 1 is characterized in that, the downside of described lateral emitting polymer optical fiber is coated with highly reflecting films.
4, according to each described side entrance back module of claim 1 to 3, it is characterized in that described light source is arranged at the one-sided of LGP, described lateral emitting polymer optical fiber is provided with reflectance coating away from an end of light source.
5, according to each described side entrance back module of claim 1 to 3, it is characterized in that described light source is arranged at the one-sided of LGP, described lateral emitting polymer optical fiber is provided with indentation, and described indentation spacing is along with the direction away from light source is successively decreased.
6, according to each described side entrance back module of claim 1 to 3, it is characterized in that described light source is arranged at the bilateral of LGP, described lateral emitting polymer optical fiber is provided with indentation, described indentation spacing by two ends to the third side to successively decreasing.
7, side entrance back module according to claim 5 is characterized in that, described indentation is V-type shape, U type shape, side convex outer curve type shape or side inner concave curve type shape.
8, side entrance back module according to claim 6 is characterized in that, described indentation is V-type shape, U type shape, side convex outer curve type shape or side inner concave curve type shape.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102072723A CN101440919A (en) | 2008-12-18 | 2008-12-18 | Side input type backlight module unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102072723A CN101440919A (en) | 2008-12-18 | 2008-12-18 | Side input type backlight module unit |
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| CN101440919A true CN101440919A (en) | 2009-05-27 |
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| CNA2008102072723A Pending CN101440919A (en) | 2008-12-18 | 2008-12-18 | Side input type backlight module unit |
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| CN102472843A (en) * | 2009-07-28 | 2012-05-23 | 住友化学株式会社 | Compound light-control plate, surface light source device, and transparent image display device |
| CN102494297A (en) * | 2011-12-07 | 2012-06-13 | 南京中电熊猫液晶显示科技有限公司 | Backlight module utilizing ambient light and liquid crystal display device comprising same |
| CN103047583A (en) * | 2012-12-07 | 2013-04-17 | 康佳集团股份有限公司 | Side light direct type backlight module |
| CN103133939A (en) * | 2011-11-30 | 2013-06-05 | 展晶科技(深圳)有限公司 | Light source structure of backlight module |
| CN103364864A (en) * | 2012-03-26 | 2013-10-23 | 联想(北京)有限公司 | Light-guide device and display equipment |
| CN103376493A (en) * | 2012-04-16 | 2013-10-30 | 鸿富锦精密工业（深圳）有限公司 | Light guide plate and manufacturing method thereof |
| CN103389538A (en) * | 2012-05-11 | 2013-11-13 | 鸿富锦精密工业（深圳）有限公司 | Light guide plate and manufacturing method thereof |
| WO2015003400A1 (en) * | 2013-07-10 | 2015-01-15 | 深圳市华星光电技术有限公司 | Liquid crystal display and backlight module thereof |
| US20150015827A1 (en) * | 2013-07-10 | 2015-01-15 | Shenzhen China Star Optoelectronics Technology Co. Ltd. | LCD and Backlight Module Thereof |
| CN104977669A (en) * | 2015-06-30 | 2015-10-14 | 联想(北京)有限公司 | Fiber transmission wire, fiber transmission method, and output method apparatus |
| CN105487292A (en) * | 2016-01-15 | 2016-04-13 | 京东方科技集团股份有限公司 | Backlight module, display device and driving method thereof |
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2008
- 2008-12-18 CN CNA2008102072723A patent/CN101440919A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102472843A (en) * | 2009-07-28 | 2012-05-23 | 住友化学株式会社 | Compound light-control plate, surface light source device, and transparent image display device |
| CN103133939B (en) * | 2011-11-30 | 2015-02-04 | 展晶科技(深圳)有限公司 | Light source structure of backlight module |
| CN103133939A (en) * | 2011-11-30 | 2013-06-05 | 展晶科技(深圳)有限公司 | Light source structure of backlight module |
| CN102494297A (en) * | 2011-12-07 | 2012-06-13 | 南京中电熊猫液晶显示科技有限公司 | Backlight module utilizing ambient light and liquid crystal display device comprising same |
| CN103364864A (en) * | 2012-03-26 | 2013-10-23 | 联想(北京)有限公司 | Light-guide device and display equipment |
| CN103376493A (en) * | 2012-04-16 | 2013-10-30 | 鸿富锦精密工业（深圳）有限公司 | Light guide plate and manufacturing method thereof |
| CN103389538A (en) * | 2012-05-11 | 2013-11-13 | 鸿富锦精密工业（深圳）有限公司 | Light guide plate and manufacturing method thereof |
| CN103047583A (en) * | 2012-12-07 | 2013-04-17 | 康佳集团股份有限公司 | Side light direct type backlight module |
| US20150015827A1 (en) * | 2013-07-10 | 2015-01-15 | Shenzhen China Star Optoelectronics Technology Co. Ltd. | LCD and Backlight Module Thereof |
| US9329317B2 (en) * | 2013-07-10 | 2016-05-03 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LCD and backlight module thereof |
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| CN106094343A (en) * | 2016-08-23 | 2016-11-09 | 深圳市华星光电技术有限公司 | Backlight and liquid crystal display |
| CN106353851B (en) * | 2016-10-20 | 2019-05-17 | 长春理工大学 | A kind of side opening lateral body emitting optical fiber, its manufacturing method and backlight module |
| CN106353851A (en) * | 2016-10-20 | 2017-01-25 | 长春理工大学 | Side light-emitting optical fiber with openings at side end and manufacturing method thereof as well as backlight module |
| CN106291804A (en) * | 2016-10-20 | 2017-01-04 | 长春理工大学 | A kind of annular opening lateral body emitting optical fiber, its manufacture method and backlight module |
| CN107861289A (en) * | 2017-09-16 | 2018-03-30 | 合肥惠科金扬科技有限公司 | A kind of backboard of optical fiber type backlight module |
| CN107870480A (en) * | 2017-09-16 | 2018-04-03 | 合肥惠科金扬科技有限公司 | A kind of optical fiber type backlight module |
| CN107783340A (en) * | 2017-09-16 | 2018-03-09 | 合肥惠科金扬科技有限公司 | A kind of processing technology of the backboard of optical fiber type backlight module |
| CN108692281A (en) * | 2018-06-06 | 2018-10-23 | 大连理工高邮研究院有限公司 | A kind of guide-lighting automobile tail light preventing light direct projection |
| CN110928051A (en) * | 2019-12-18 | 2020-03-27 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN113267936A (en) * | 2021-01-05 | 2021-08-17 | 青岛海信移动通信技术股份有限公司 | Electronic terminal |
| CN113267936B (en) * | 2021-01-05 | 2022-12-27 | 青岛海信移动通信技术股份有限公司 | Electronic terminal |
| CN115857228A (en) * | 2023-02-27 | 2023-03-28 | 合肥泰沃达智能装备有限公司 | Side-in miniLED (light-emitting diode) zone-controlled backlight module |
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Open date: 20090527 |