CN1866058A - Optical prism assembly - Google Patents
Optical prism assembly Download PDFInfo
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- CN1866058A CN1866058A CNA2005100680928A CN200510068092A CN1866058A CN 1866058 A CN1866058 A CN 1866058A CN A2005100680928 A CNA2005100680928 A CN A2005100680928A CN 200510068092 A CN200510068092 A CN 200510068092A CN 1866058 A CN1866058 A CN 1866058A
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- prism
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Abstract
The disclosed optical lens group fit to a backlight module comprises: a first lens with a first refraction surface and a near first incidence surface to from an included angle in 50-70deg, a second lens with a second incidence surface almost parallel to the first refraction surface, and a medium layer with smaller refraction rate between two lenses.
Description
Technical field
The invention belongs to the light-emitting device parts, particularly a kind of optical prism group.
Background technology
Light emitting diode (LED) is a kind of light-emitting component that directly electric energy is converted into luminous energy, and it is low to have operating voltage, and power consumption is few; Stable performance, the life-span long (being generally 100,000 to 1,000 ten thousand hours); Shock resistance, vibration resistance is strong; In light weight, volume is little, low cost and other advantages.
Light emitting diode is mainly as the optical fiber communication light source of display element and short distance, low rate, as the demonstration of literal, numerical digit and other symbols of various instrument and meter indicators etc.
In recent years, the backlight liquid crystal display module has also adopted the light-emitting component of light emitting diode as its inside.Therefore, disperse the technology of light emitting diode light also to become one of research emphasis.
Light emitting diode comprises light emitting die (Die) and two leads, it can be considered the light source that meets Lambert cosine law (Lambert ' s cosine law), be called Lambertian source (Lambertian source), the characteristic of light emitting diode is that luminous intensity is directly proportional approximately with the cosine at luminous visual angle, and brightness and view directions are irrelevant.In order to control the brightness on the different directions, generally include the eyeglass that covers light emitting die in the encapsulating structure of light emitting diode, so as to the light that guides light emitting die to launch.
As shown in Figure 1, the traditional eyeglass that is packaged in the light emitting diode outside (Lens) 10 shapes such as dome lampshade, the visual angle increases to 90 ° according to the diagram direction of arrow by 0 °.
As Fig. 2, shown in Figure 3, be brightness and the angular relationship figure (CandelaDistribution) after the light ejaculation conventional lenses 10.Among the figure during 0 ° of display view angle brightness be 90 * 10 to the maximum
3Nits, brightness increases with the visual angle and successively decreases.When the visual angle increased to 90 °, brightness had leveled off to 0nits.
Hence one can see that, and light penetration conventional lenses 10 backs are in the direction set at 0 ° at visual angle.With the light emitting diode of conventional lenses 10 encapsulation as shown in Figure 3 via the backlight optical Simulation result.The illustrated longitudinal axis is brightness, and unit is nits; The distance of transverse axis right representative transverse axis backlight by a left side.By the brightness curve changing condition, after light penetrated conventional lenses 10 as can be known, the brightness of zones of different was quite inhomogeneous.
In order to increase the homogeneity of luminance brightness backlight, be the framework backlight that the down straight aphototropism mode set (Direct-type LED backlight) of light source is to use Lumileds company mostly at present with the light emitting diode.
As shown in Figure 4, existing is that the down straight aphototropism mode set 20 of light source has storage tank 21, several light emitting diodes 22 and diffuser plate 23 with the light emitting diode.
Diffuser plate 23 is covered in storage tank 21 tops, the light that several light emitting diodes 22 of arranging by diffuser plate 23 diffusion linears are launched.
As shown in Figure 5, be the package structure for LED of Lumileds company.In storage tank 21 inside of module 20 backlight, light emitting diode 22 is fixed on the base plate 211.As shown in the figure, the encapsulating structure of light emitting diode 22 comprises housing 221 and eyeglass 222.
As shown in Figure 6, it is coniform that eyeglass 222 tops of the light emitting diode 22 of Lumileds company design are handstand to lower recess, and eyeglass 222 top inner wall have the effect of reflection ray.When light is up penetrated top inner wall to eyeglass 222 by fixture 2211 inside, disperse by the reflection of the handstand circular conical surface of top inner wall and towards positive and negative 90 ° of directions.
As shown in Figure 7, be the brightness and the angular relationship figure of the light emitting diode 22 of Lumileds company.Brightness concentrates between 80 ± 20 ° as seen from the figure, in other words, does not almost have light by penetrating directly over the eyeglass 222.As shown in Figure 8, be the backlight optical simulation of the light emitting diode eyeglass 222 of Fig. 6.The illustrated longitudinal axis is brightness, and unit is nits; The distance of transverse axis right representative transverse axis backlight by a left side.By its brightness curve changing condition, after light passed the eyeglass 222 of light emitting diode 22 of Lumileds company as can be known, the brightness of zones of different can reach pretty good uniformity coefficient.
By above explanation as can be known, after light passed conventional lenses 10, the brightness of different color light or different visual angles direction was neither evenly.If use Lumileds eyeglass 222, though good uniformity coefficient is arranged, its top for the cone shape structure that stands upside down makes that lens design, manufacturing and packaging cost are too high, is difficult for forming volume production to lower recess.
Summary of the invention
The purpose of this invention is to provide a kind of raising light luminance in different visual angles direction homogeneity, make different color light even brightness optical prism group.
The present invention is applicable in the module backlight; The optical prism group comprises first prism, second prism and is folded in dielectric layer between first and second prism; First prism has first refractive optical surface and is adjacent to first light entrance face of first refractive optical surface; First refractive optical surface and first light entrance face have 50 ° to 70 ° angle; Second prism has in opposite directions and slightly is parallel to second light entrance face of first refractive optical surface; Dielectric layer has the refractive index less than first prism and second prism.
Wherein:
Dielectric layer is an air layer.
The thickness of dielectric layer is 0.1mm to 0.3mm.
First prism can be with the refractive index of second prism and equates.
The angle of first refractive optical surface and first light entrance face is 55 ° to 65 °.
First prism has more the 3rd refractive optical surface in abutting connection with first light entrance face, and the angle of the 3rd refractive optical surface and 80 ° to 85 ° of first light entrance face formation.
Second prism has second refractive optical surface in abutting connection with second light entrance face, and forms 35 ° to 45 ° angle between second refractive optical surface and second light entrance face.
The light source module of using optical prism group of the present invention comprises the light source that is disposed at optical prism group below, and throw light through first light entrance face to the optical prism group.
The light source module of using optical prism group of the present invention more comprises storage tank and is covered in diffuser plate on the optical prism group; Storage tank comprises the base plate that is provided with at least one light source.
Because the present invention is applicable in the module backlight; The optical prism group comprises first prism, second prism and is folded in dielectric layer between first and second prism; First prism has first refractive optical surface and is adjacent to first light entrance face of first refractive optical surface; First refractive optical surface and first light entrance face have 50 ° to 70 ° angle; Second prism has in opposite directions and slightly is parallel to second light entrance face of first refractive optical surface; Dielectric layer has the refractive index less than first prism and second prism.During use, the present invention is assembled in the light source top of light source module, make light that light source projects goes out by the first light entrance face vertical incidence, first prism after, at first arrive first refractive optical surface.At this moment, if the angle of light going direction and the first refractive optical surface normal direction during greater than critical angle, then causes total reflection at first refractive optical surface, and passes after reflecting.If the angle of light going direction and the first refractive optical surface normal direction during less than critical angle, then reflects at first refractive optical surface and enters dielectric layer, reflect once more by second light entrance face by dielectric layer again and enter second prism.And by the refractive index of first and second prism refractive index greater than dielectric layer, a part of incident ray is directed at concentrates on the left side outgoing of optical prism group, another part incident ray is directed at the purpose that concentrates on the right side outgoing of optical prism group, makes optical prism group both sides brightness height and middle body brightness is low.Need not change the low unit price packaged type of traditional light emitting diode after the present invention promptly is set, can replace habitual in the market side light-emitting diode; The optical prism group all can be reached with general glass of high refractive index or plastic material, as boron silicate crown glass (BK7), polymethylmethacrylate (PMMA), polycarbonate (PC) etc., low price; During use, can finely tune according to the size and the light emitting diode arrangement of module backlight, design change elasticity is big.Not only improve light luminance in different visual angles direction homogeneity, and make different color light brightness even, thereby reach purpose of the present invention.
Description of drawings
Fig. 1, be traditional light emitting diode lens structure diagrammatic side view.
Fig. 2, be brightness and angular relationship synoptic diagram after light penetrates conventional lenses.
Fig. 3, be that light emitting diode with conventional lenses encapsulation is with backlight optical analog result synoptic diagram.
Fig. 4, for known be the down straight aphototropism mode set decomposition texture schematic isometric of light source with the light emitting diode.
Fig. 5, be the light emitting diode construction schematic isometric of Lumileds company.
Fig. 6, be the light emitting diode lens structure diagrammatic side view of Lumileds company.
Fig. 7, be brightness and angular relationship synoptic diagram after light penetrates the light emitting diode of Lumileds company.
Fig. 8, be that light emitting diode with the encapsulation of Lumileds company eyeglass is with backlight optical analog result synoptic diagram.
Fig. 9, for side-looking structural representation sectional view of the present invention.
Figure 10, for using light source modular structure diagrammatic side view of the present invention.
Figure 11, for leaded light of the present invention path synoptic diagram.
Figure 12, for the present invention in the visual angle light flux variations figure in positive and negative 80 °.
Figure 13, for the present invention with backlight optical analog result synoptic diagram.
Figure 14, for using back light module unit structure schematic isometric of the present invention.
Figure 15, for using back light module unit structure diagrammatic side view of the present invention.
Figure 16, for using back light module unit structure schematic isometric of the present invention (several pointolites are arranged in the array pattern).
Figure 17, be A portion partial enlarged drawing among Figure 16.
Embodiment
As shown in Figure 9, optical prism group 30 of the present invention is made up of first prism 31, second prism 32 and the dielectric layer 33 that is folded between first and second prism 31,32.
First and second prism 31,32 all has two end faces and at least three inclined-planes.
First prism 31 has first refractive optical surface 311 and is adjacent to first light entrance face 312 of first refractive optical surface 311.First refractive optical surface 311 and first light entrance face 312 have and are about 50 ° to 70 ° angle.
Second prism 32 has in opposite directions and rough second light entrance face 321 that is parallel to first refractive optical surface 311.
Dielectric layer 33 materials between first refractive optical surface 311 and second light entrance face 321 have the refractive index less than first prism 31 and second prism 32.
In the embodiment of the invention, first prism 31 and the refractive index of second prism 32 can be and equate or unequal, and its kind is not also limit, and for example right-angle prism, roof prism etc. are all applicable.The end surface shape of first and second prism 31,32 also is not limited to triangle, quadrilateral or four polygons that the limit is above in addition, and meaning promptly is not limited to prism, four prisms or polygon prism.
Dielectric layer 33 is preferably air layer, and its thickness is 0.1mm to 0.3mm.
The included angle A of first refractive optical surface 311 and first light entrance face 312 is 55 ° to 65 °.In addition, first prism 31 has more the 3rd refractive optical surface 313 in abutting connection with first light entrance face 312, and the included angle B of the 3rd refractive optical surface 313 and 80 ° to 85 ° of first light entrance face, 312 formation.
Second prism 32 has second refractive optical surface 322 in abutting connection with second light entrance face 321, and forms 35 ° to 45 ° angle C between second refractive optical surface 322 and second light entrance face 321.What deserves to be mentioned is that the angle C of second refractive optical surface 322 and second light entrance face 321 is that the included angle A with first refractive optical surface 311 and first light entrance face 312 is positioned at the corresponding position for dielectric layer 33 both sides of air layer.First and second prism 31,32 can high index of refraction glass or plastic material manufacturing, as boron silicate crown glass (BK7), polymethylmethacrylate (PMMA), polycarbonate (PC) etc., and can arrange fine setting according to size backlight and light emitting diode.
As shown in figure 10, the light source module 40 of application optical prism group of the present invention comprises that optical prism group 30 of the present invention reaches the light source 42 that keeps spacing t with optical prism group 30.
The eyeglass 10 that is packaged in light source 42 outsides adopts conventional lenses as shown in Figure 1 to get final product.After light passes eyeglass 10, be incident to optical prism group 30 via first light entrance face 312.Light source 42 also can use line source, for example cold cathode ray tube except pointolites such as employing light emitting diode.
In better embodiment, light source 42 is 0mm to 3mm with the better spacing t of optical prism group 30.More specifically, spacing t is the distance of the light source 42 and first light entrance face 312.In addition, the air layer 33a thickness that inserted and put of first and second prism 31,32 is preferably 0.1mm to 0.3mm.As previously mentioned, to have included angle A be that 55 ° to 65 °, included angle B are that 80 ° to 85 °, angle C are 35 ° to 45 ° for preferable optical prism group 30.First and second prism 31,32 can high index of refraction glass or plastic material manufacturing, as boron silicate crown glass (BK7), polymethylmethacrylate (PMMA), polycarbonate (PC) etc.What deserves to be mentioned is that included angle A, included angle B, angle C all are positioned at the side of optical prism group 30 of the present invention near light source 42.
As shown in figure 11, be the leaded light path synoptic diagram of optical prism group 30 of the present invention.Light by first light entrance face, 312 vertical incidence, first prism 31 after, at first arrive first refractive optical surface 311.At this moment, if the angle of light going direction and first refractive optical surface, 311 normal directions during greater than critical angle, then causes total reflection at a of first refractive optical surface 311 point, after the refraction of the 3rd refractive optical surface 313, pass its course such as optical path 34 again.If the angle of light going direction and first refractive optical surface, 311 normal directions during less than critical angle, then reflects at first refractive optical surface 311 and enters dielectric layer 33, reflect once more by second light entrance face 321 by dielectric layer 33 again and enter second prism 32.At this moment, if the refractive index equal and opposite in direction of second prism 32 and first prism 31, then the direct of travel of light in second prism 32 is parallel to the direct of travel in first prism 31, as optical path 35.If the refractive index of second prism 32 is greater than the refractive index of first prism 31, then the direct of travel of light in second prism 32 is partial to the left side such as the optical path 36 of optical path 35.
What deserves to be mentioned is, refractive index magnitude relationship regardless of first prism 31 and second prism 32, both all must can reach greater than the refractive index of dielectric layer 33 a part of incident ray is directed at and concentrate on the 30 left side outgoing of optical prism group, another part incident ray is directed at the purpose that concentrates on the 30 right side outgoing of optical prism group, makes optical prism group 30 both sides brightness height and middle body brightness is low.
As shown in figure 12, for optical prism group 30 of the present invention in the visual angle light flux variations figure in positive and negative 80 °.Shown in curve 37, light is passed through after the optical prism group 30, concentrates on significantly in the positive and negative 30-50 in visual angle ° of two zones.
As shown in figure 13, for optical prism group 30 of the present invention via the backlight optical Simulation result.The illustrated longitudinal axis is brightness, and unit is nits; The distance of transverse axis right representative transverse axis backlight by a left side.The brightness curve changing condition of Figure 13 and Fig. 8 relatively, optical prism group 30 of the present invention as can be known is except the brightness that makes zones of different reaches pretty good uniformity coefficient, and its light intensity also is higher than the framework of habitually practising in the market backlight.Utilize optical prism group 30 to have a part of incident ray is directed to concentrate on the left side outgoing, another part incident ray is directed at the characteristic that concentrates on the right side outgoing, can suitably be arranged in the module backlight to increase the deployment conditions of light.
As Figure 14, shown in Figure 15, the module backlight 50 of using this optical prism group 30 comprises storage tank 21, at least one light source 42, be located at the optical prism group 30 on each light source 42 and be covered in diffuser plate 23 on the optical prism group 30.
As Fig. 9, shown in Figure 15, first and second prism 31,32 of optical prism group 30 can bind the back to be decided on the storage tank 21 that the part (not shown) is fixed in module 50 backlight with external reinforcement, or is fixed on the storage tank 21 of module 50 backlight with fixture respectively without bonding.Therefore, first and second prism 31,32 can be finely tuned according to the size and pointolite 42 arrangements of module 50 backlight.In better embodiment, several pointolites 42 are to be arranged in several straight lines, and the optical prism group 30 of pointolite 42 tops of adjacent two line spread has the first opposite refractive optical surface 311 of slope.
Shown in Figure 16,17, several pointolites 42 also can be arranged in the array pattern.Each pointolite 42 top that is arranged in array all are provided with optical prism group 30, first refractive optical surface, the 311 direction differences of adjacent optical prism group 30.Optical prism group 30 makes its first refractive optical surface 311 tilt to make full use of the characteristic of optical prism group 30 towards the front, rear, left and right of module 60 backlight via suitable arrangement, and it is more even that light is disperseed.Except above-mentioned structure, down straight aphototropism mode set still can optionally be set up other elements, for example increases the diffusion sheet of uniformity coefficient and the optical reinforced film of increase brightness.
Method provided by the present invention and device when comparing mutually with known techniques, have more and get row characteristic and advantage ready:
1, need not change the low unit price packaged type of traditional light emitting diode, only increase optical prism group of the present invention and can replace habitual in the market side light-emitting diode.
2, optical prism group of the present invention all can be reached with general glass of high refractive index or plastic material, as boron silicate crown glass (BK7), polymethylmethacrylate (PMMA), polycarbonate (PC) etc., low price.
3, can finely tune according to the size and the light emitting diode arrangement of module backlight, design change elasticity is big.In sum, the present invention not only really belongs to innovation on technological thought, and can promote above-mentioned effect than traditional methods, should fully meet the legal patent of invention important document of novelty and progressive.
Claims (9)
1, a kind of optical prism group, it is applicable in the light source module, it is characterized in that the optical prism group comprises first prism, second prism and is folded in dielectric layer between first and second prism; First prism has first refractive optical surface and is adjacent to first light entrance face of first refractive optical surface; First refractive optical surface and first light entrance face have 50 ° to 70 ° angle; Second prism has in opposite directions and slightly is parallel to second light entrance face of first refractive optical surface; Dielectric layer has the refractive index less than first prism and second prism.
2, optical prism group according to claim 1 is characterized in that described dielectric layer is an air layer.
3, optical prism group according to claim 1, the thickness that it is characterized in that described dielectric layer is 0.1mm to 0.3mm.
4, optical prism group according to claim 1 is characterized in that described first prism can be with the refractive index of second prism to equate.
5, optical prism group according to claim 1, the angle that it is characterized in that described first refractive optical surface and first light entrance face are 55 ° to 65 °.
6, optical prism group according to claim 1 is characterized in that described first prism has more the 3rd refractive optical surface in abutting connection with first light entrance face, and the angle of the 3rd refractive optical surface and 80 ° to 85 ° of first light entrance face formation.
7, optical prism group according to claim 1 is characterized in that described second prism has second refractive optical surface in abutting connection with second light entrance face, and forms 35 ° to 45 ° angle between second refractive optical surface and second light entrance face.
8, optical prism group according to claim 1, the light source module that it is characterized in that described application optical prism group of the present invention comprises the light source that is disposed at optical prism group below, and throw light through first light entrance face to the optical prism group.
9, optical prism group according to claim 8, the light source module that it is characterized in that described application optical prism group of the present invention more comprise storage tank and are covered in diffuser plate on the optical prism group; Storage tank comprises the base plate that is provided with at least one light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100680928A CN100373177C (en) | 2005-05-16 | 2005-05-16 | Optical prism assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100680928A CN100373177C (en) | 2005-05-16 | 2005-05-16 | Optical prism assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1866058A true CN1866058A (en) | 2006-11-22 |
| CN100373177C CN100373177C (en) | 2008-03-05 |
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ID=37425128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100680928A Active CN100373177C (en) | 2005-05-16 | 2005-05-16 | Optical prism assembly |
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| Country | Link |
|---|---|
| CN (1) | CN100373177C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249328A (en) * | 2016-07-21 | 2016-12-21 | 马鞍山市江南光学有限公司 | A kind of Abbe roof prism production technology |
| CN109343301A (en) * | 2018-10-31 | 2019-02-15 | 苏州佳世达光电有限公司 | Projection arrangement |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002148688A (en) * | 2000-11-06 | 2002-05-22 | Olympus Optical Co Ltd | Illuminating device |
| US6871982B2 (en) * | 2003-01-24 | 2005-03-29 | Digital Optics International Corporation | High-density illumination system |
| JP4316281B2 (en) * | 2003-04-08 | 2009-08-19 | 恵和株式会社 | Optical unit and backlight unit using the same |
-
2005
- 2005-05-16 CN CNB2005100680928A patent/CN100373177C/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249328A (en) * | 2016-07-21 | 2016-12-21 | 马鞍山市江南光学有限公司 | A kind of Abbe roof prism production technology |
| CN109343301A (en) * | 2018-10-31 | 2019-02-15 | 苏州佳世达光电有限公司 | Projection arrangement |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100373177C (en) | 2008-03-05 |
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