CN101561587A - LED lens capable of being used for direct LCD backlight - Google Patents
LED lens capable of being used for direct LCD backlight Download PDFInfo
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- CN101561587A CN101561587A CNA200810104242XA CN200810104242A CN101561587A CN 101561587 A CN101561587 A CN 101561587A CN A200810104242X A CNA200810104242X A CN A200810104242XA CN 200810104242 A CN200810104242 A CN 200810104242A CN 101561587 A CN101561587 A CN 101561587A
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Abstract
The invention relates to an LED lens capable of being used for a direct LCD backlight. The lens is an axial symmetry entity made of transparent materials and comprises a bottom surface, a side, an upper curved surface and a center curved surface, wherein the bottom surface is a light incident surface; the side is a light refracting interface; the upper curved surface is the light refracting interface; and the center curved surface is the light refracting interface. The lens is arranged on an LED and enables the transmission direction of light rays entering the lens to change so as to obtain good light intensity distribution and realize the uniform illumination of the LED.
Description
Technical field
The present invention relates to a kind of LED lens, especially relate to a kind of LED lens that can be used for direct LCD backlight.
Background technology
The cold-cathode tube of traditional LCD (CCFL) backlight is replaced by light emitting diode (LED) backlight gradually.But it is different with the line source cold-cathode tube, LED belongs to the pointolite that sends the certain angle light beam, when being used for directly-down liquid crystal display (LCD) backlight, needing hundreds of even thousands of three-primary color LEDs to be arranged into certain array and form area source, then liquid crystal panel is thrown light on.
Changing into uniform surface light source from pointolite, is the gordian technique in LED-backlit source.The uniformity coefficient of the area source that led array forms is closely relevant with the light distribution of LED.The LED of a part is not before placing lens, its light distribution is usually near lambertian distribution, after traditional dome-type lens are placed on the LED, changed the light distribution of LED, make light more concentrate on the LED axis near, as shown in Figure 1, the lens 11 of packing forms 10 have class dome-type structure, the led chip of packing forms 10 (not drawing) is positioned in the reflector (not drawing), and lens 11 make LED have light distribution 12, and the LED emergent ray concentrates near the axis 13.The array that this kind LED arranges has certain dark space owing between the LED certain spacing is arranged between the adjacent LED emergent light, be difficult to obtain uniform surface light source, during in particular for the limited direct LCD backlight in space; In addition, another kind of common lens are edge-emitting LED lens, and the most of emergent ray that makes LED is along departing near the direction outgoing of axis ± 80-90 degree, as shown in Figure 2.But this light distribution type usually near 0 degree angle intensity still bigger, as shown in Figure 3, make that illumination is bigger than normal directly over the LED, cause the centre speck obvious, uniformity of illuminance is still lower, the uniformity coefficient of the resulting planar light source of its array is also just good inadequately.
Two kinds of traditional LED packing forms of above-mentioned this, when being used for the LCD direct LED backlight, because its light distribution too concentrates near the axis or too concentrates on the side, backlight is difficult to obtain high evenness, causes optical uniformity to become the most eager key issue that will solve of LCD direct LED backlight.Optical uniformity, thin thickness are two important indicators of liquid crystal backlight.Traditional LED packing forms, when being used for the LCD direct LED backlight, in order to improve the light uniformity coefficient, the light that increases led array usually mixes height, increases thickness, influences the light characteristic of backlight, is restricting the application and the development of LCD direct LED backlight.
Summary of the invention
The objective of the invention is to, a kind of LED lens are provided, when being used for the LCD direct LED backlight, can make LCD display under the situation that does not increase thickness, obtain higher light uniformity coefficient with the LED of this lens packages.
The present invention proposes a kind of lens that can be used for the LED of direct LCD backlight, is the rotational symmetry entity of being made by transparent material, it is characterized in that, comprising:
A bottom surface, this bottom surface are light entrance face;
A side, this side are the anaclasis interface;
A top-surface camber, this curved surface are the anaclasis interface;
A central surface, this curved surface are the anaclasis interface.
Further, described bottom surface is perpendicular to the axis.
Further, described side is the face of cylinder or the circular conical surface of a connection bottom surface.
Further, described cross section is two camber lines.
Further, become the light of 10 degree～30 degree with the bottom surface, can directly not change the original direction of propagation from described top-surface camber outgoing.
Further, described central surface is in the lens center.
Further, described central surface is the spherical crown curved surface.
Further, also comprise a circular conical surface in the described top-surface camber.
The invention has the beneficial effects as follows: this kind LED lens have been optimized the emergent light light distribution of LED, make with the single lamp of the LED of this kind lens packages when the plane directly over it is shone, and still obtain high uniformity of illuminance in small distance.These LED are used for the LCD direct LED backlight, can satisfy the good and thin thickness requirement of optical uniformity of backlight simultaneously.
Description of drawings
Fig. 1 is LED sketch and a light distribution sketch thereof of having placed traditional hemispherical lens;
Fig. 2 is traditional LED limit diversing lens;
Fig. 3 is a light distribution sketch of having placed the LED of traditional limit diversing lens;
Fig. 4 (a) is the structure diagram of first embodiment of the present invention;
Fig. 4 (b) is the structure diagram of second embodiment of the present invention;
Fig. 5 has placed the light distribution sketch after the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Lens shown in Fig. 4 (a) and Fig. 4 (b) are two embodiment of the present invention, it is the rotary body made from transparent material with rotational symmetry center, material therefor includes but not limited to cycloolefin co-polymer (COC), polymethylmethacrylate (PMMA), polycarbonate (PC) and polyetherimide (PEI).The index of refraction in lens is generally between 1.4 and 1.6, but according to the application of concrete material and can slightly change.Lens can obtain by some ripe technology manufacturings, as diamond cutting, and injection molding or the like.
Fig. 4 (a) has 4 basic sides, comprises plane of incidence A1, enters lens from the led chip outgoing with through the light beam with the light distribution of approximate lambert's type that the led support reflective cup reflects is come out via incident surface A 1; Face A2, A3, A4 are light-emitting face, A4 is the curved surface of approximate spherical crown but is not limited to similar spherical crown, centering near axis light beam is regulated, for example among the figure light 1 via curved surface A4 outgoing, make along near the light quantity of the outgoing axis and remain on certain level, and keep suitable ratio with side emergent light light quantity, shown in Fig. 4 (a).A3 is main exit facet, and most of light is from this face outgoing, for example light 2 and light 3 A3 face outgoing thus among the figure, especially, behind light 3 process incident surface A 1 and the exit facet A3, still can keep the original direction of propagation substantially, the angle theta of light 3 and incident surface A 1 is between 10 degree and 30 degree; A2 is approximate cylinder, but is not limited to cylinder.Light 3 is to keep the light of the former direction of propagation through lens, and LED emergent light major part is along this direction outgoing.If adjust the height of A3, the angle theta of light 3 and incident surface A 1 will change, and then influence the light distribution of LED.In practical application, can be according to the relative position of led chip and lens, and led array at interval and backlight expection thickness select suitable height value, to obtain suitable light distribution, the uniformity coefficient of raising LCD backlight.The similar lambert's type of light distribution when LED does not place lens distributes, if when being placed in these lens on the LED, can obtain being similar to the light distribution of Fig. 5, wherein light intensity peak be in 60 spend to 80 the degree between, and be about 8 times of 0 degree direction light intensity, the single lamp of this kind LED can obtain at 20mm place halfwidth greater than be 40m than uniform light spots, can obtain uniformity coefficient when being used for direct LCD backlight greater than 85%.
Another concrete lens arrangement that lens shown in lens shown in Fig. 4 (b) and Fig. 4 (a) are approximate.Ratio for the emergent light and near the emergent light the axis of appropriate change side, on the basis of lens shown in Fig. 4 (a), on curved surface B4, increase a curved surface B3 again, this curved surface is a frustum cone side, shown in Fig. 4 (b), light 3 is with it into about 90 degree angles.Lens shown in Fig. 4 (b) have 5 basic sides, comprise plane of incidence B1, enter lens from the led chip outgoing with through the light beam with the light distribution of approximate lambert's type that the led support reflective cup reflects is come out via plane of incidence B1; Face B2, B3, B4, B5 are light-emitting face, and B5 is for the curved surface of approximate spherical crown but be not limited to similar spherical crown, and centering near axis light beam is regulated, for example among the figure light 1 via curved surface B5 outgoing; B3, B4 are main exit facet, and most of light is from this face outgoing, for example light 2 and light 3 exit facet outgoing thus among the figure, especially, behind light 3 process plane of incidence B1 and the exit facet B3, still can keep the original direction of propagation substantially, the angle theta of light 3 and plane of incidence B1 is between 10 degree and 30 degree; B2 is approximate cylinder, but is not limited to cylinder, and light 3 is to keep the light of the former direction of propagation through lens, and LED emergent light major part is along this direction outgoing.If adjust the height of B2, the angle theta of light 3 and plane of incidence B1 will change, and then influence the light distribution of LED, in practical application, can be according to the relative position of led chip and lens, and led array at interval and backlight expect that thickness selects suitable height value.The similar lambert's type of light distribution when LED does not place lens distributes, if when being placed in these lens on the LED, can obtain being similar to the light distribution of Fig. 5, wherein light intensity peak be in 60 spend to 80 the degree between, and be about 8 times of 0 degree direction light intensity, the single lamp of this kind LED can obtain at 20mm place halfwidth greater than be 40m than uniform light spots, can obtain uniformity coefficient when being used for direct LCD backlight greater than 85%.
The front has specifically described embodiment of the present invention, be to be understood that, for a people with the common skill in present technique field, under the situation that does not deviate from scope of the present invention, above-mentioned and in additional claim, change and adjust in the special scope of the present invention that proposes and to reach purpose of the present invention equally.
Claims (8)
1. lens that can be used for the LED of direct LCD backlight are rotational symmetry entities of being made by transparent material, it is characterized in that, comprising:
A bottom surface, this bottom surface are light entrance face;
A side, this side are the anaclasis interface;
A top-surface camber, this curved surface are the anaclasis interface;
A central surface, this curved surface are the anaclasis interface.
2. lens as claimed in claim 1 is characterized in that described bottom surface is perpendicular to the axis.
3. lens as claimed in claim 1 is characterized in that, described side is the face of cylinder or the circular conical surface of a connection bottom surface.
4. lens as claimed in claim 1 is characterized in that, described cross section is two camber lines.
5. lens as claimed in claim 1 is characterized in that, become the light of 10 degree～30 degree with the bottom surface, can directly not change the original direction of propagation from described top-surface camber outgoing.
6. lens as claimed in claim 1 is characterized in that described central surface is in the lens center.
7. lens as claimed in claim 1 is characterized in that, described central surface is the spherical crown curved surface.
8. lens as claimed in claim 1 is characterized in that, also comprise a circular conical surface in the described top-surface camber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810104242XA CN101561587A (en) | 2008-04-16 | 2008-04-16 | LED lens capable of being used for direct LCD backlight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810104242XA CN101561587A (en) | 2008-04-16 | 2008-04-16 | LED lens capable of being used for direct LCD backlight |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101561587A true CN101561587A (en) | 2009-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200810104242XA Pending CN101561587A (en) | 2008-04-16 | 2008-04-16 | LED lens capable of being used for direct LCD backlight |
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| Country | Link |
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| CN (1) | CN101561587A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011082564A1 (en) * | 2010-01-08 | 2011-07-14 | 赵翼 | Light scattering and filtering lens for led illuminating chip |
| CN102313162A (en) * | 2010-07-09 | 2012-01-11 | 奇菱科技股份有限公司 | Light source device and backlight module with same |
| CN103196097A (en) * | 2013-04-17 | 2013-07-10 | 杭州奥通科技有限公司 | LED quadratic cylindrical lens for direct type backlight source |
| CN102141215B (en) * | 2010-01-28 | 2014-04-16 | 奇菱光电股份有限公司 | Light source device and backlight module with same |
| CN103900023A (en) * | 2012-12-28 | 2014-07-02 | 鸿富锦精密工业（深圳）有限公司 | Optical lens and light-emitting component using the optical lens |
| CN104820313A (en) * | 2015-05-26 | 2015-08-05 | 武汉华星光电技术有限公司 | Direct type LED (light emitting diode) backlight module and liquid crystal display device |
| WO2021196593A1 (en) * | 2020-04-02 | 2021-10-07 | 深圳创维－Rgb电子有限公司 | Mini lamp bead, fabrication method, backlight source and display device |
-
2008
- 2008-04-16 CN CNA200810104242XA patent/CN101561587A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011082564A1 (en) * | 2010-01-08 | 2011-07-14 | 赵翼 | Light scattering and filtering lens for led illuminating chip |
| CN102141215B (en) * | 2010-01-28 | 2014-04-16 | 奇菱光电股份有限公司 | Light source device and backlight module with same |
| CN102313162A (en) * | 2010-07-09 | 2012-01-11 | 奇菱科技股份有限公司 | Light source device and backlight module with same |
| CN103900023A (en) * | 2012-12-28 | 2014-07-02 | 鸿富锦精密工业（深圳）有限公司 | Optical lens and light-emitting component using the optical lens |
| CN103196097A (en) * | 2013-04-17 | 2013-07-10 | 杭州奥通科技有限公司 | LED quadratic cylindrical lens for direct type backlight source |
| CN103196097B (en) * | 2013-04-17 | 2016-01-20 | 杭州奥通科技有限公司 | A kind of LED quadric cylinder lens for downward back radiant |
| CN104820313A (en) * | 2015-05-26 | 2015-08-05 | 武汉华星光电技术有限公司 | Direct type LED (light emitting diode) backlight module and liquid crystal display device |
| WO2021196593A1 (en) * | 2020-04-02 | 2021-10-07 | 深圳创维－Rgb电子有限公司 | Mini lamp bead, fabrication method, backlight source and display device |
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Open date: 20091021 |