CN102287717A - Back light system with wave guide structure - Google Patents
Back light system with wave guide structure Download PDFInfo
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- CN102287717A CN102287717A CN2011102458701A CN201110245870A CN102287717A CN 102287717 A CN102287717 A CN 102287717A CN 2011102458701 A CN2011102458701 A CN 2011102458701A CN 201110245870 A CN201110245870 A CN 201110245870A CN 102287717 A CN102287717 A CN 102287717A
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Abstract
The invention relates to a back light system with a wave guide structure, which comprises a plurality of light emitting diode (LED) light sources and a light guide plate, wherein the light guide plate is provided with a light outlet surface and a light inlet surface, a plurality of optically isolated regions and wave guide structures are arranged on the light guide plate, the wave guide structures consist of fiber cores with the refractive index greater than that of peripheral substances, light beams sent by the LED light sources are guided and input to each region of the light guide plate through the wave guide structure, scattering net points are respectively arranged on the regions, and the light beams are uniformly emitted out from the light outlet surface of the light guide plate in each region through the scattering net points. The dynamic region dimming in a smaller region is realized, and the back light system has the characteristics that the outlet light is uniform, the optical efficiency is high, and the back light system is lighter and thinner.
Description
Technical field
The present invention relates to the technical field of liquid crystal display and illumination, particularly relate to a kind of back light system of realizing regional dynamic light adjustment ability that is used for liquid crystal display and illumination with waveguiding structure.
Background technology
In liquid crystal display and the advertising lighting, need a flat illumination light source.It mainly comprises formations such as light source (as light emitting diode, cold cathode ray tube or Organic Light Emitting Diode), LGP, diffusion sheet, prismatic brightness sheet and reflector plate.Its major function is that a point or line source are converted into area source.In traditional liquid crystal display, the bright dark and change color of image is by liquid crystal applied voltages is realized regulating.Advertisement then is to realize by the paper that has colour or black and white coating.In liquid crystal display or advertising lighting, image information often is not that whole face all is bright attitude, and perhaps the color of zones of different is different.But since backlight all be that whole face is opened, for a certain image, some zone does not need to throw light on or does not need the light of other color, and these light will absorb and slattern because of being polarized sheet and colored filter, because of the light leak of liquid crystal, the contrast of image also can descend simultaneously.In order to improve the contrast that energy use efficiency reduces power consumption and improves image, a kind of regional tunable optical back light system with low resolution technology is suggested, its main function is the image information that cooperates liquid crystal display, does zonal brightness and colourity and regulate on corresponding backlight.According to the ability difference of light modulation, local dimming mainly can be divided into the overall situation, a peacekeeping two dimension.Wherein two-dimentional light modulation has more advantage on the quality of energy-conservation and image increases.According to mode difference backlight, local dimming has two kinds of methods: a kind of is that side is advanced the light local dimming, light source lay respectively at LGP around.Another is a straight-down negative, and promptly light source is positioned at the below of LGP.And in order to realize local dimming, traditional cold cathode ray tube (CCFL) has been replaced by light emitting diode (LED), and the benefit of LED replaced C CFL is to increase color range simultaneously.The major defect that side is advanced the light formula is a brightness irregularities, and that the shortcoming of straight-down negative is a thickness is too high: in order to realize uniform bright dipping, the light source distance LGP needs certain distance.Recently, in order to realize more frivolous local dimming back light system, a kind of backlight design that combines the advantage of side entering type and straight-down negative is suggested.As publication number is the United States Patent (USP) of 2007/0247871 A1, and the zone of its division backlight is exactly that LGP unit by each side-light type constitutes.Each unit has the independent led light source of oneself, can carry out independent bright shadow joint.But this method exists problems such as the complicated and heat radiation of the driving wiring of light source is relatively poor.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of back light system with waveguiding structure is provided, this system has the local dimming function, and the layout of more frivolous, light source is simple more, help dispelling the heat, energy efficiency is high and save a lot of splicing problems.
Technical solution of the present invention is as follows:
A kind of back light system with waveguiding structure comprises a plurality of led light sources and the LGP with exiting surface and incidence surface, has the zone and the waveguiding structure of isolating mutually on a plurality of optics on this LGP; Described waveguiding structure is made of the fibre core of refractive index greater than ambient substance; Light beam that described led light source sends is input to each zone of described LGP through described waveguide guiding, all is provided with scattering netted dot on this each zone, this scattering netted dot make described light beam in described each zone equably the exiting surface from described LGP penetrate.
The zone of described LGP is the zone that embeds the inverted v-shaped groove isolation of described LGP shady face, or embeds the zone of the rectangular reflection structure isolation of described LGP shady face.
The shape in described zone and size are arbitrarily.
The shady face of described LGP also is provided with reflecting plate.
Described waveguiding structure has at least one input, corresponding at least one the described led light source of each input.
To be the refractive index that is embedded in described LGP greater than the sandwich layer of LGP constitute, be buried in described waveguiding structure that refractive index in the described LGP constitutes greater than the sandwich layer of LGP or optical fiber constitutes.The cross section of described waveguiding structure for circular, square, trapezoidal, fall trapezoidal or taper, the size of described waveguiding structure is with diminishing gradually away from light source.
Described scattering netted dot is arranged on the direction that described waveguide guiding light advances, and the diameter of this scattering netted dot increases gradually along the light direct of travel, and the density of this scattering netted dot increases gradually along the light direct of travel.
Constituting of described waveguide:
Described led light source is made of red-light LED, green light LED and blue-ray LED, described waveguide merges into a combinatorial input waveguide by ruddiness input waveguide, green glow input waveguide and blue light input waveguide and constitutes, the ruddiness that described led light source is sent respectively by red-light LED, green light LED and blue-ray LED, green glow and blue light converge into described combinatorial input waveguide through described ruddiness input waveguide, green glow input waveguide and blue light input waveguide respectively, and this combinatorial input waveguide is connected to the corresponding zone of described LGP;
Or described led light source is made of red-light LED, green light LED, blue-ray LED and white light LEDs, described waveguide comprises ruddiness input waveguide, green glow input waveguide, blue light input waveguide and white light input waveguide, described ruddiness input waveguide, green glow input waveguide, the earlier synthetic combinatorial input waveguide of blue light input waveguide, described white light input waveguide synthesizes a total input waveguide with described combinatorial input waveguide again, and this total input waveguide is connected to the corresponding zone of described LGP;
Or described led light source is made of red-light LED, green light LED, blue-ray LED and white light LEDs, described waveguide connects an input waveguide by the awl waveguide and constitutes, and described ruddiness, green glow, blue light and white light are connected to the respective regions of described LGP by described awl waveguide and input waveguide;
Or described led light source is made of red-light LED, green light LED, blue-ray LED and white light LEDs, described LED ruddiness, LED green glow and LED blue light be a corresponding ruddiness input waveguide, green glow input waveguide and blue light input waveguide respectively, at least the corresponding white light input waveguide of a branch of LED white light, this each ruddiness input waveguide, green glow input waveguide, blue light input waveguide and white light input waveguide are connected the respective regions of described LGP respectively.
Described input waveguide, combinatorial input waveguide or total input waveguide are in described regional inner bending.
Another kind of technical solution of the present invention is a kind of back light system with waveguiding structure, comprise a plurality of led light sources and a LGP with exiting surface and incidence surface, described led light source is by red-light LED, green light LED and blue-ray LED constitute, by described red-light LED, the ruddiness that green light LED and blue-ray LED send respectively, green glow and blue light correspond respectively to the ruddiness input waveguide, green glow input waveguide and blue light input waveguide, described ruddiness input waveguide, green glow input waveguide and blue light input waveguide are parallel to each other, form a striped that traverses described LGP that RGB is alternate, constitute a pixel cell, corresponding with the pixel of liquid crystal panel, on the direction of waveguide, scattering netted dot is being set.
Compared with prior art the invention has the beneficial effects as follows can under the side incident light light source is placed on LGP around, overcome problems such as the inhomogeneous and optical efficiency of the bright dipping of traditional side entering type is low, realize the dynamic area light modulation of zonule more, back light system is more frivolous.
Description of drawings
Fig. 1 is LGP, waveguide and light source allocation plan among first kind of embodiment of the present invention.
Fig. 2 is provided with figure for light source among second kind of embodiment of the present invention and input waveguide.
Fig. 3 is provided with figure for light source among the third embodiment of the present invention and input waveguide.
Fig. 4 is LGP, waveguide and light source allocation plan among the 4th kind of embodiment of the present invention.
Fig. 5 is at each regional inner waveguide structure chart among the 5th kind of embodiment of the present invention.
Fig. 6 is LGP, waveguide and light source allocation plan among the 6th kind of embodiment of the present invention.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is further described, but should limit protection scope of the present invention with this.
Please consult Fig. 1-5 earlier, a kind of back light system with waveguiding structure comprises a plurality of led light sources and the LGP with exiting surface and incidence surface, has the zone and the waveguiding structure of isolating mutually on a plurality of optics on this LGP; Described waveguiding structure is made of the fibre core of refractive index greater than ambient substance; Light beam that described led light source sends is input to each zone of described LGP through described waveguide guiding, all is provided with scattering netted dot on this each zone, this scattering netted dot make described light beam in described each zone equably the exiting surface from described LGP penetrate.The zone of described LGP is the zone that embeds the inverted v-shaped groove isolation of described LGP shady face, or embeds the zone of the rectangular reflection structure isolation of described LGP shady face.The shape in described zone and size are arbitrarily.The shady face of described LGP also is provided with reflecting plate.Described waveguiding structure has at least one input, corresponding at least one the described led light source of each input.To be the refractive index that is embedded in described LGP greater than the sandwich layer of LGP constitute, be buried in described waveguiding structure that refractive index in the described LGP constitutes greater than the sandwich layer of LGP or optical fiber constitutes.The cross section of described waveguiding structure for circular, square, trapezoidal, fall trapezoidal or taper, the size of described waveguiding structure is with diminishing gradually away from light source.Described scattering netted dot is arranged on the direction that described waveguide guiding light advances, and the diameter of this scattering netted dot increases gradually along the light direct of travel, and the density of this scattering netted dot increases gradually along the light direct of travel.
Fig. 1 is LGP among first kind of embodiment of the present invention, waveguide and light source allocation plan, led light source is by red-light LED as seen from the figure, green light LED and blue-ray LED constitute, described waveguide is by the ruddiness input waveguide, green glow input waveguide and blue light input waveguide merge into a combinatorial input waveguide and constitute, described led light source is by red-light LED, the ruddiness that green light LED and blue-ray LED send respectively, green glow and blue light are respectively through described ruddiness input waveguide, green glow input waveguide and blue light input waveguide converge into described combinatorial input waveguide, and this combinatorial input waveguide is connected to the corresponding zone of described LGP.LGP has 16 zones, is isolated by the inverted v-shaped groove that embeds described LGP shady face to constitute.The respectively corresponding red, green, blue three color LED in each zone, the respectively corresponding input waveguide of the LED of three colors merges at last and organizes input waveguide one by one, is input to the respective regions in the LGP.Waveguiding structure is positioned at the exiting surface of LGP, is rectangular configuration, and material is the same with LGP.In order to improve the coupling efficiency of input light, input waveguide is done the inside of tapered guide tabula rasa and is extended.In order to make each regional bright dipping even, each regional exiting surface is provided with scattering netted dot, in order to improve the front light emission rate of LGP, at the shady face of LGP reflecting plate is set.The waveguide that is input to intra-zone is between inverted v-shaped groove.
Fig. 2 is provided with figure for light source among second kind of embodiment of the present invention and input waveguide, as seen from the figure, led light source is by red-light LED, green light LED, blue-ray LED and white light LEDs constitute, described waveguide comprises the ruddiness input waveguide, the green glow input waveguide, blue light input waveguide and white light input waveguide, described ruddiness input waveguide, the green glow input waveguide, the earlier synthetic combinatorial input waveguide of blue light input waveguide, described white light input waveguide synthesizes a total input waveguide with described combinatorial input waveguide again, and this total input waveguide is connected to the corresponding zone of described LGP.Each corresponding red, green, blue three colors in zone and a white light LEDs, the light of four LED is input to the interior respective regions of LGP at last through waveguide.During work, can control each LED separately, realize toning and degree of lightening.
Fig. 3 is provided with figure for light source among the third embodiment of the present invention and input waveguide.As seen from the figure, led light source is made of red-light LED, green light LED, blue-ray LED and white light LEDs, described waveguide connects an input waveguide by the awl waveguide and constitutes, and described ruddiness, green glow, blue light and white light are connected to the respective regions of described LGP by described awl waveguide and input waveguide.
Fig. 4 is LGP, waveguide and light source allocation plan among the 4th kind of embodiment of the present invention.As seen from the figure, led light source is made of red-light LED, green light LED, blue-ray LED and white light LEDs, described LED ruddiness, LED green glow and LED blue light be a corresponding ruddiness input waveguide, green glow input waveguide and blue light input waveguide respectively, at least the corresponding white light input waveguide of a branch of LED white light, this each ruddiness input waveguide, green glow input waveguide, blue light input waveguide and white light input waveguide are connected the respective regions of described LGP respectively.The core structure of waveguide is for being embedded in the LGP waveguide index n
1Greater than LGP n
2
Fig. 5 among the 5th kind of embodiment of the present invention at each regional inner waveguide figure that advances.As shown in the figure, in each zone, waveguiding structure bends, and bending angle should be able to satisfy light in waveguide core layer and skin total reflection can take place, otherwise is unfavorable for the transmission of light.Scattering netted dot is set in waveguide, and along wave guide direction, the site size increases gradually, and the density of site also increases gradually.
See also Fig. 6, Fig. 6 is LGP, waveguide and light source allocation plan among the 6th kind of embodiment of the present invention.As seen from the figure, a kind of back light system with waveguiding structure, comprise a plurality of led light sources and a LGP with exiting surface and incidence surface, described led light source is by red-light LED, green light LED and blue-ray LED constitute, by described red-light LED, the ruddiness that green light LED and blue-ray LED send respectively, green glow and blue light correspond respectively to the ruddiness input waveguide, green glow input waveguide and blue light input waveguide, described ruddiness input waveguide, green glow input waveguide and blue light input waveguide are parallel to each other, form a striped that traverses described LGP that RGB is alternate, constitute a pixel cell, corresponding with the pixel of liquid crystal panel, on the direction of waveguide, scattering netted dot is being set.Make positive emitting brightness unanimity in the same waveguide.Entire backlight constitutes the illuminator of and liquid crystal panel pixel correspondence like this.Use by aiming at, make the backlight of each color can avoid the absorption loss of colored filter, reach energy-conservation effect by the colored filter of respective color on the liquid crystal panel with liquid crystal panel.
Claims (11)
1. the back light system with waveguiding structure is characterised in that it comprises a plurality of led light sources and the LGP with exiting surface and incidence surface, has the zone and the waveguiding structure of isolating mutually on a plurality of optics on this LGP; Described waveguiding structure is made of the fibre core of refractive index greater than ambient substance; Light beam that described led light source sends is input to each zone of described LGP through described waveguide guiding, all is provided with scattering netted dot on this each zone, this scattering netted dot make described light beam in described each zone equably the exiting surface from described LGP penetrate.
2. the back light system with waveguiding structure as claimed in claim 1, it is characterized in that, the zone of described LGP is the zone that embeds the inverted v-shaped groove isolation of described LGP shady face, or embeds the zone of the rectangular reflection structure isolation of described LGP shady face.
3. the back light system with waveguiding structure as claimed in claim 1 is characterized in that the shape in described zone and size are arbitrarily.
4. the back light system with waveguiding structure as claimed in claim 1 is characterized in that the shady face of described LGP also is provided with reflecting plate.
5. the back light system with waveguiding structure as claimed in claim 1 is characterized in that described waveguiding structure has at least one input, corresponding at least one the described led light source of each input.
6. the back light system with waveguiding structure as claimed in claim 1, it is characterized in that to be the refractive index that is embedded in described LGP greater than the sandwich layer of LGP constitute, be buried in described waveguiding structure that refractive index in the described LGP constitutes greater than the sandwich layer of LGP or optical fiber constitutes.
7. as claims 1 described back light system, it is characterized in that with waveguiding structure, the cross section of described waveguiding structure for circular, square, trapezoidal, fall trapezoidal or taper, the size of described waveguiding structure is with diminishing gradually away from light source.
8. the back light system with waveguiding structure as claimed in claim 1, it is characterized in that, described scattering netted dot is arranged on the direction that described waveguide guiding light advances, the diameter of this scattering netted dot increases gradually along the light direct of travel, and the density of this scattering netted dot increases gradually along the light direct of travel.
9. as each described back light system of claim 1 to 8, it is characterized in that the constituting of described waveguide with waveguiding structure:
Described led light source is made of red-light LED, green light LED and blue-ray LED, described waveguide merges into a combinatorial input waveguide by ruddiness input waveguide, green glow input waveguide and blue light input waveguide and constitutes, the ruddiness that described led light source is sent respectively by red-light LED, green light LED and blue-ray LED, green glow and blue light converge into described combinatorial input waveguide through described ruddiness input waveguide, green glow input waveguide and blue light input waveguide respectively, and this combinatorial input waveguide is connected to the corresponding zone of described LGP;
Or described led light source is made of red-light LED, green light LED, blue-ray LED and white light LEDs, described waveguide comprises ruddiness input waveguide, green glow input waveguide, blue light input waveguide and white light input waveguide, described ruddiness input waveguide, green glow input waveguide, the earlier synthetic combinatorial input waveguide of blue light input waveguide, described white light input waveguide synthesizes a total input waveguide with described combinatorial input waveguide again, and this total input waveguide is connected to the corresponding zone of described LGP;
Or described led light source is made of red-light LED, green light LED, blue-ray LED and white light LEDs, described waveguide connects an input waveguide by the awl waveguide and constitutes, and described ruddiness, green glow, blue light and white light are connected to the respective regions of described LGP by described awl waveguide and input waveguide;
Or described led light source is made of red-light LED, green light LED, blue-ray LED and white light LEDs, described LED ruddiness, LED green glow and LED blue light be a corresponding ruddiness input waveguide, green glow input waveguide and blue light input waveguide respectively, at least the corresponding white light input waveguide of a branch of LED white light, this each ruddiness input waveguide, green glow input waveguide, blue light input waveguide and white light input waveguide are connected the respective regions of described LGP respectively.
10. as claims 9 described back light systems, it is characterized in that described input waveguide, combinatorial input waveguide or total input waveguide are in described regional inner bending with waveguiding structure.
11. back light system with waveguiding structure, it is characterized in that, comprise a plurality of led light sources and a LGP with exiting surface and incidence surface, described led light source is by red-light LED, green light LED and blue-ray LED constitute, by described red-light LED, the ruddiness that green light LED and blue-ray LED send respectively, green glow and blue light correspond respectively to the ruddiness input waveguide, green glow input waveguide and blue light input waveguide, described ruddiness input waveguide, green glow input waveguide and blue light input waveguide are parallel to each other, form a striped that traverses described LGP that RGB is alternate, constitute a pixel cell, corresponding with the pixel of liquid crystal panel, on the direction of waveguide, scattering netted dot is being set.
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| CN108139065A (en) * | 2015-10-06 | 2018-06-08 | 康宁股份有限公司 | For the spatial multiplexing coupler of light guide plate |
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Application publication date: 20111221 |