CN102252263A - Optical device for obtaining surface light source by line light source - Google Patents
Optical device for obtaining surface light source by line light source Download PDFInfo
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- CN102252263A CN102252263A CN2011100913092A CN201110091309A CN102252263A CN 102252263 A CN102252263 A CN 102252263A CN 2011100913092 A CN2011100913092 A CN 2011100913092A CN 201110091309 A CN201110091309 A CN 201110091309A CN 102252263 A CN102252263 A CN 102252263A
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- light source
- optical device
- incident light
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- optically denser
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Abstract
The invention discloses an optical device for obtaining a surface light source by a line light source. The optical device comprises an optically dense medium which is arranged in atmospheric environment and has a stepped fully reflecting surface and a saw-toothed emergent surface, wherein a plurality of groups of parallel incident light sources are arranged on one side of the optically dense medium; light rays of the parallel incident light sources are vertical to the optically dense medium; an included angle between the stepped fully reflecting surface and vertical lines of the incident light rays is a critical angle alpha of the incident light during full reflection from the optically dense medium to an air medium; and the included angle between the saw-toothed emergent surface and a horizontal plane is the critical angle alpha of the incident light during full reflection from the optically dense medium to the air medium. The line light source is emitted from a side face, refracted by the stepped fully reflecting surface under the optical device and vertically emitted from the saw-toothed emergent surface above the optical device, so conversion between the line light source and the surface light source is finished. The optical device can be widely applied to the fields of backlight sources of liquid crystal televisions, experimental devices and the like.
Description
Technical field
The invention belongs to optical field, be specifically related to a kind of Optical devices that line source can be converted to area source, can be widely used in occasions such as LCD (LCD) backlight.
Background technology
The proximal line light source that LED is formed converts uniform surface light source to, and wide application prospect is arranged.Be widely used in fields such as television set and display as LCD (LCD) with its good performance.But liquid crystal is a kind of material that is situated between between liquid and crystal, and itself is not luminous, but changes its molecules align state by voltage, promptly applies different voltage to liquid crystal and just can control the throughput of light, thereby show diversified image.Because liquid crystal itself can't be luminous, so all LCD need back lighting.The backlight of LCD nearly all is CCFL (Cold CathodeFluorescent Lamps, a cold-cathode fluorescence lamp) at present.Because cold-cathode fluorescence lamp is not an area source, therefore in order to realize the uniform brightness output of backlight, the module backlight of the LCD numerous additional devices such as diffusion sheet, LGP, reflecting plate of also will arranging in pairs or groups, thus cause the complex structure of backlight, cost rises, and thickness increases.Nonetheless, obtain as the unusual difficulty still of the output of brightness uniformly as the CRT.In addition, when most of LCD deceives picture entirely in vain or entirely in demonstration, fairly obvious its outstanding defective that just becomes of the difference of screen edge and center brightness.Therefore when the LCD industry makes great efforts to open up new application, the high performance of backlight technology (as high brightness, high uniformity, low cost, low power consumption, lightening etc.) is very important.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art,, provide a kind of Optical devices that obtain area source by line source according to the total reflection principle and the invertibity of light.
For achieving the above object, the technical solution used in the present invention is: comprise being positioned in the atmospheric environment and having the step fully reflecting surface and the optically denser medium of zigzag exit facet structure, be sidelong at one of this optically denser medium and be equipped with some groups of parallel incident light sources, the light of the incident light source that this is parallel is normally incident in optically denser medium, angle between the vertical line of described step fully reflecting surface 1 and incident ray is the critical angle α of incident light when total reflection takes place (air) from this optically denser medium to optically thinner medium, and the angle between described zigzag exit facet and the horizontal plane is the critical angle α during to air dielectric generation total reflection for this optically denser medium.
Described optically denser medium adopts the good and epoxy resin that refractive index is high of light conductivity to make.
In fact has certain altitude and the characteristics of an imperfect line according to the LCD line source, adopting the optically denser medium that fully reflecting surface and exit facet are arranged to be positioned in the atmospheric environment among the present invention constitutes, wherein line source incident from the side, after the step fully reflecting surface reflects below the process device, vertically penetrate from top zigzag exit facet, thereby finish the conversion of line source to area source.
Description of drawings
Fig. 1 is the light path two-dimensional representation that area source converts line source to;
Fig. 2 is the light path two-dimensional representation that line source converts area source to.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Referring to Fig. 1, when being extended when forming width and being the line source of W along fore-and-aft direction by several A, B, C, D, E, F, the intensity of its line source depends primarily on the quantity of led light source; And the length of line source is exactly W.
Equally, for one dimension schematic diagram shown in Figure 2, when the line source with certain altitude when fore-and-aft direction extend to be formed its width and is W, be W, length planar light source with forming width, and its intensity is relevant with incident ray light source H by how many decisions of zigzag exit facet.
Referring to Fig. 1, because some groups of LED type sources of parallel light are luminescence chip A, B, C, D, E, F and G when inciding epoxy resin and two kinds of light mediums of air interface with critical angle, can produce total reflection and form line source H, as shown in Figure 1.So according to the reversibility pricinple of geometric optics, placing one group of line source H with certain altitude that is made of LED in outgoing place injects parallel rays, and by after 1 total reflection of step fully reflecting surface, to there be parallel rays A, B, C, D, E, F and G to form uniform surface light source equally, as shown in Figure 2 from positive evenly ejaculation of epoxide resin material.Thereby realized line source is converted to the purpose of area source.
The present invention just is being based on this principle design, the present invention includes the step fully reflecting surface 1 that is positioned in the atmospheric environment and the optically denser medium of zigzag exit facet 2 is epoxy resin 3, be sidelong at one of this optically denser medium 3 and be equipped with some groups of parallel incident light sources 4, the light of this parallel incident light source 4 is perpendicular to optically denser medium 4, angle between the vertical line of described step fully reflecting surface 1 and incident ray is the critical angle α of incident light during from this optically denser medium to air dielectric generation total reflection, and the angle between described zigzag exit facet 2 and the horizontal plane is the critical angle α during to air dielectric generation total reflection for this optically denser medium.
For backlight in the LCD TV, certainly shooting angle α is the smaller the better, ideal situation is that vertical when α=0 to penetrate glass planar best, in fact because the optical material restriction, α is generally about 30 ° even bigger, if but the method for the mutual compensation of this symmetrical structure about adopting and up and down still can guarantee the even performance of backlight.
If optical media 1 is air and optical media 2 is that the refractive index of epoxy resin is respectively n and n
/, according to Snell's law:
sinα/sinα
/＝＝n
//n
So when total reflection takes place, refraction angle α
/==90 °, at this moment Dui Ying incidence angle α is exactly critical angle α
0So, can calculate: α
0==arcsin (n
// n)
For example to have added refractive index behind the titanium dioxide be that the epoxy resin of n=1.82 is as encapsulating material when selecting for use; Then in air, n
/=1.0, so when epoxy resin and air interface generation total reflection, α
/=90 °, the substitution following formula:
α＝33.7°
Promptly constitute led light source in the encapsulating structure as shown in Figure 1 for the material of above optical parametric, as long as when encapsulation, guarantee that the Line beam that luminescence chip sends enters epoxy resin in this way, then will be with the even outgoing of the critical angle α=33.7 ° angle of emergence, thus realize the LED line source is converted to area source.
Claims (2)
1. Optical devices that obtain area source by line source, it is characterized in that: comprise being positioned in the atmospheric environment and having step fully reflecting surface (1) and the optically denser medium (3) of zigzag exit facet (2) structure, be sidelong at one of this optically denser medium (3) and be equipped with some groups of parallel incident light sources (4), the light of this parallel incident light source (4) is normally incident in optically denser medium (4), angle between the vertical line of described step fully reflecting surface (1) and incident ray is the critical angle α of incident light when total reflection takes place (air) from this optically denser medium to optically thinner medium, and the angle between described zigzag exit facet (2) and the horizontal plane is the critical angle α during to air dielectric generation total reflection for this optically denser medium.
2. according to claim 1ly obtain the Optical devices of area source by line source, it is characterized in that: described optically denser medium (3) adopts the good and epoxy resin that refractive index is high of light conductivity to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100913092A CN102252263A (en) | 2011-04-12 | 2011-04-12 | Optical device for obtaining surface light source by line light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100913092A CN102252263A (en) | 2011-04-12 | 2011-04-12 | Optical device for obtaining surface light source by line light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102252263A true CN102252263A (en) | 2011-11-23 |
Family
ID=44979709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100913092A Pending CN102252263A (en) | 2011-04-12 | 2011-04-12 | Optical device for obtaining surface light source by line light source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102252263A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105898113A (en) * | 2014-05-07 | 2016-08-24 | 光宝科技股份有限公司 | Image obtaining module and assembling method thereof |
-
2011
- 2011-04-12 CN CN2011100913092A patent/CN102252263A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105898113A (en) * | 2014-05-07 | 2016-08-24 | 光宝科技股份有限公司 | Image obtaining module and assembling method thereof |
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Application publication date: 20111123 |