CN103543481A - Reflection-type second lens - Google Patents
Reflection-type second lens Download PDFInfo
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- CN103543481A CN103543481A CN201310547372.1A CN201310547372A CN103543481A CN 103543481 A CN103543481 A CN 103543481A CN 201310547372 A CN201310547372 A CN 201310547372A CN 103543481 A CN103543481 A CN 103543481A
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Abstract
A reflection-type second lens comprises a left part and a right part which are symmetrical. Each part comprises a first curved face, a second curved face and a side face, wherein the first curved face is located at the bottom, the second curved face is located on the top, the first curved face is connected with the second curved face through the side face, the joint position of the second curved face and the side face is an arc-shaped shoulder part, and the starting point and the end point of the arc-shaped shoulder part are in smoothly transition with the gravity point of the second curved face and the starting point of the side face respectively. Due to the fact that the shoulder parts are designed to be of an arc-shaped structure, the scattering angle of light rays emitted from the shoulder parts is increased, and the defect that displaying MURA exists because of the original bright ring effect of the shoulder parts is overcome.
Description
Technical field
The present invention relates to plane and show field, relate in particular to diffuser plate of a kind of reflective secondary lens down straight aphototropism mode set and preparation method thereof.
Background technology
Back light is widely applied in conventional liquid crystal (LCD) and large-scale advertisement plate.And traditional cold-cathode tube (CCFL) backlight is replaced by light emitting diode (LED) backlight gradually.And the light guide plate that initial backlight is processed by back side carving realizes, light source (CCFL of line source or the LED of pointolite) imports light into from light guide plate side, and this kind of mode is due to the restriction of light guide plate technology, and efficiency is not high.Light efficiency problem has effectively been improved in directly-down liquid crystal display backlight source.Because LED belongs to the pointolite of limited angle light beam, when for direct LED backlight, need hundreds of even thousands of white or three-primary color LED to arrange and form area source, form a large-area planar and throw light on.
Pointolite is changed into area source, is the gordian technique in LED-backlit source.Light source uniformity coefficient and mixed light height are two very important performance index of backlight.
Refer to Fig. 1, Fig. 1 is a kind of structural representation of existing LED down straight aphototropism mode set, and as shown in the figure, this backlight module is provided with end framework 1 backlight, diffuser plate 2, birefringence lens 5, LED light source 4, bottom reflection plate 3; Described diffuser plate 2 is connected with the marginal position of end framework 1 backlight, and described bottom reflection plate 3 is located at end framework 1 bottom inside backlight, and LED light source 4 is fixed on bottom reflection plate 3, and birefringence lens 5 are located at the top of LED light source 4 and the below of diffuser plate 2.Bottom reflection plate 3 is light mixing distance H to the distance of diffuser plate 2, distance between each LED light source 4 is P, the numerical response of H/P the quantity of LED lamp and the thickness of backlight module, conventionally in cost and apparent consideration, in the situation that not affecting use, wish that the value of H/P is the smaller the better.
Refer to Fig. 2, Fig. 2 is a kind of existing refraction type secondary lens, this refraction type secondary lens produces the emergent ray of wide-angle variations by the birefringence of incident ray, thereby can increase the scattering degree of light source, under the help of these refraction type birefringence lens, the numerical value of existing H/P is probably between 0.25-0.4.
In order further to reduce the value of this H/P, reflective secondary lens is further applied in LED down straight aphototropism mode set.As shown in Figure 3, Fig. 3 is a kind of existing reflective secondary lens, and this reflective secondary lens is that the total reflection of using incident ray to occur in mirror realizes the object diffusing out into light angle.Because in its emergent ray, quite a few,, with compared with wide-angle outgoing from the side, therefore, under the help of these secondary reflection lens, can make H/P reach 0.1-0.15.
Yet this reflective secondary lens, the joining place of its end face and side is sharp-angle type shoulder structure, this horn structure can make part light directly from shoulder, with relatively uniform angle, reflect away, therefore can see at shoulder and occur bright especially hot spot, reaction in liquid crystal display time, just there will be the MURA phenomenon of display effect.In addition, in this existing reflective secondary lens, the contour curve of its side changes single, most of light is after the total reflection of end face, with a relatively angle outgoing for level, this horizontal light needs could finally from diffuser plate, penetrate through multiple reflections in backlight module, therefore has the problem that light source utilization factor is low, causes the brightness of backlight module not to be maximized utilization.
Therefore be necessary to propose a kind of new reflective secondary lens, to improve the problems referred to above.
Summary of the invention
In view of this, the object of the invention is to propose a kind of new reflective secondary lens, can improve shoulder bright ring problem in existing lensing, and the light utilization that improves reflective secondary lens, thereby improved brightness and the homogeneity of backlight module.
A kind of reflective secondary lens proposing according to object of the present invention, comprise symmetrical two parts, wherein each part comprise be positioned at bottom first surface, be positioned at second curved surface and the side that is connected first surface and the second curved surface at top, the joining place of described the second curved surface and side is circular-arc shoulder, and the starting point of this circular-arc shoulder and terminal seamlessly transit with the emphasis of the second curved surface and the starting point of side respectively.
Preferably, the height of described circular-arc shoulder is 0.8mm-1mm, and radius is 1.5mm-1.7mm.
Preferably, the folded angle of the starting point of described first surface and terminal and bottom mid point line is 0 degree; The folded angle of the starting point of described the second curved surface and terminal and bottom mid point line is 40 degree to 50 degree; The folded angle of the starting point of described circular-arc shoulder and terminal and bottom mid point line is 5 degree to 10 degree; The folded angle of the starting point of described side and terminal and bottom mid point line is 40 degree to 45 degree.
Preferably, described side is that the first of ，Gai side, two-period form side is straight line, and second portion is that circular arc ，Gai first is connected with described shoulder, and this second portion is connected with described first surface.
Preferably, the straight line of described first outwards becomes 5 °-10 ° with vertical direction, and length is 2.5mm-3mm.
Preferably, the crown height of described second portion is 2mm-3mm, and radius is 2.2mm-2.5mm.
Preferably, described side is that two parts of ，Gai side, two-period form side are respectively two slope over 10 positive and negative straight line each other.
Preferably, described first surface is provided with microstructure, makes the reflection angle of reflection ray present irregularities, to increase light homogeneity during outgoing from lens.
Compared with prior art, reflective secondary lens of the present invention, by shoulder is designed to arc structure, increases the emergent ray scattering angle of shoulder, thereby has reduced the bright ring effect of shoulder.The present invention is simultaneously by becoming two-part structure by the lateral layout of reflective secondary lens, make the emergent ray of side there is larger emergence angle up or down, solved the low problem of light utilization that previous level light too much brings, the brightness that has improved whole backlight module.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of structural representation of existing LED down straight aphototropism mode set.
Fig. 2 is a kind of existing refraction type secondary lens.
Fig. 3 is a kind of existing reflective secondary lens.
Fig. 4 is the structural representation of the reflective secondary lens under first embodiment of the invention.
Fig. 5 is the light simulation drawing of reflective secondary lens in Fig. 4.
Fig. 6 is the structural representation of the reflective secondary lens under second embodiment of the invention.
Fig. 7 is the light simulation drawing of the reflective secondary lens under another embodiment of the present invention.
Embodiment
As described in the background art, in existing reflective secondary lens, there are two defects: first, shoulder at reflective secondary lens, the existing horn structure that is designed to, this horn structure causes the light in this region to have obvious distortion performance, makes the light of shoulder outgoing form bright ring, causes the MURA defect to display effect.Second, internal light is through after end face total reflection, penetrate from the side, and in existing design, the side of secondary lens is a class plane that ratio of transformation is more single, so the light that total reflection is gone out can be with the angle outgoing of a comparison level, and this horizontal light finally need to could penetrate through after several secondary reflections from backlight module, has caused the utilization factor of light low.
Therefore, the present invention proposes a kind of reflective secondary lens of property, this reflective secondary lens has designed the arc structure of a mild transition in the junction of end face and side.So, internal light is when shoulder reflection reflects, and for the slope rate continuity variation of arc surface, this part light can form dispersion effect with different angle outgoing, has reduced the generation of bright ring effect.In addition, at lateral parts, the present invention has designed two-part side, and the horizontal bright dipping of side has been reduced in this two-part side, has increased the amount of light that makes progress and downward amount of light, thereby has improved the utilization factor of light.
Below, technology technical scheme of the present invention is specifically described.
Refer to Fig. 4, Fig. 4 is the structural representation of the reflective secondary lens under first embodiment of the invention.As shown in the figure, this reflective secondary lens 10 comprises symmetrical two parts 11 and 12.Take this right half part 11 is example, this right half part 11 comprise be positioned at bottom first surface 111, be positioned at second curved surface 112 and the side 113 that is connected first surface 111 and the second curved surface 112 at top.
For reflective secondary lens, light source (being LED in this) is usually located at centre position, bottom, the light that light source sends is injected lens from the bottom of lens, as can be seen from Figure 5, all light can be divided into two parts, part light incides on second curved surface 112 at top, and a part of light directly reflects lens behind side 113 in addition.On second curved surface 112 at top tangent slope be a little designed to can carry out total reflection according to the incident angle of this part light, so, after the total reflection of this part light through the second curved surface 112, on side 113, there is refraction and penetrate or reflex to the first surface 111 that is positioned at bottom.The reflection horizon on first surface 111 with coating reflecting material, all light inciding on first surface 111 is all reflected.Further, on this first surface 111, some microstructures can be set, make the reflection angle of reflection ray present irregularities, to increase light homogeneity during outgoing from lens.
In the present invention, the joining place of the second curved surface 112 and side 113 is designed to circular-arc shoulder 114, the starting point of this circular-arc shoulder 114 and terminal seamlessly transit with the terminal of the second curved surface 112 and the starting point of side 113 respectively.Seamlessly transitting here refers to have continuity at the slope of the second curved surface 112 destination counties and the slope at shoulder 114 starting point places rate of change consistent or slope, but not breakpoint or singular point.Equally, at the slope of shoulder 114 destination counties and the slope at 113 starting point places, side rate of change consistent or slope, there is continuity, but not breakpoint or singular point.This have a variation seamlessly transitting, and farthest reduced light in the contingent crowding effect of shoulder, reduced the possibility that bright ring produces.By shoulder 114 places are arranged to arc structure, the light in this region can be reflected away with the angle of relative diffusion, and because light concentrating in certain direction can, by the light of diffusion with the scattering within the specific limits of more uniform mode, have been avoided in circular-arc surface.Thereby solved the demonstration MURA defect that original bright ring phenomenon is brought.
For the magnitude relationship of each curved surface in this reflective secondary lens is better described, in the present invention, to adopt following mode to be described: the starting point of each curved surface and terminal are distributed and do line with the bottom mid point of reflective secondary lens, the viewpoint definition that above-mentioned two lines of every curved surface are folded this curved surface account for the distribution range of whole secondary lens profile.Wherein, the first surface 111 that is positioned at bottom is essentially a horizontal plane, so the starting point of this first surface 111 and terminal and the folded angle of bottom mid point line are 0 degree substantially; Being positioned at the folded angle of the starting point of the second curved surface 112 at top and terminal and bottom mid point line is 40 degree to 50 degree; Being positioned at the folded angle of the starting point of circular arc of shoulder 114 and terminal and bottom mid point line is 5 degree to 10 degree; Being positioned at the folded angle of the starting point of curved surface of side and terminal and bottom mid point line is 40 degree to 45 degree.The circular arc at shoulder 114 places has the maximum height of whole reflective secondary lens, and this maximum height is about 0.8mm-1mm, and the radius of this circular arc is about 1.5mm-1.7mm.
Refer to Fig. 6, Fig. 6 is the structural representation of the reflective secondary lens under second embodiment of the invention.As shown in the figure, this reflective secondary lens, under the basis of the first embodiment, is further designed to two-part structure by side 113.Wherein the first 1131 of this side 113 is connected with shoulder 114, and second portion 1132 is connected with first surface 111.In a kind of preferred embodiment Zhong，Gai first 1131, be one section of straight line, become 5-10 ° with vertical direction outwards, the about 2.5-3mm of length, side second portion 1132 is circular arc, highly about 2-3mm, radius is 2.2-2.5mm.Because total reflection light out from the second curved surface 112 generally all has larger angle, so being mainly used to the part reflection ray near side by the second curved surface, first 1131 reflects away, and the light of horizontal direction is through after the refraction of this first 1131 originally, there is a larger angle outgoing, no matter the light of this wide-angle still directly enters into diffuser plate upward through the anti-reflection in the end down, all only need through less reflection, therefore higher to the utilization factor of light ray energy.And after second portion 1132 is designed to circular arc, part does not reflect through end face but is directly injected into the light on side, can have a larger diffusion angle, increase the randomness of light, thus make backlight module integral body to go out light effect more even.
The description of the magnitude relationship of same two parts for side, also be by explaining with the angle of mid point line, wherein, the folded angle 15 of the starting point of first 1131 and terminal and bottom mid point line is spent to 25 degree, and the folded angle of the starting point of second portion 1132 and terminal and bottom mid point line is 15 degree to 25 degree.
Refer to Fig. 7, Fig. 7 is another distortion under the second embodiment.In the reflective secondary lens shown in Fig. 7, two parts of side 113 are respectively two slope over 10 positive and negative straight line each other.With the slope of the right half part Wei Li， side first 1131 of whole lens, for just, and the slope of second portion 1132 is for negative, and it goes out light effect as shown in Figure 7.Can find out, through the lateral layout of this two-part, reduce the levelness of the light reflecting away from the side, thereby reach the problem that reduces light ray energy loss.
In sum, the present invention proposes a kind of reflective secondary lens, this secondary lens, by shoulder is designed to arc structure, increases the emergent ray scattering angle of shoulder, has solved the demonstration MURA defect that original bright ring effect because of shoulder occurs.The present invention is simultaneously by becoming two-part structure by the lateral layout of reflective secondary lens, make the emergent ray of side there is larger emergence angle up or down, solved the low problem of light utilization that previous level light too much brings, the brightness that has improved whole backlight module.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to embodiment illustrated herein, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a reflective secondary lens, comprise symmetrical two parts, wherein each part comprise be positioned at bottom first surface, be positioned at second curved surface and the side that is connected first surface and the second curved surface at top, it is characterized in that: the joining place of described the second curved surface and side is circular-arc shoulder, the starting point of this circular-arc shoulder and terminal seamlessly transit with the emphasis of the second curved surface and the starting point of side respectively.
2. reflective secondary lens as claimed in claim 1, is characterized in that: the height of described circular-arc shoulder is 0.8mm-1mm, and radius is 1.5mm-1.7mm.
3. reflective secondary lens as claimed in claim 1, is characterized in that: the folded angle of the starting point of described first surface and terminal and bottom mid point line is 0 degree; The folded angle of the starting point of described the second curved surface and terminal and bottom mid point line is 40 degree to 50 degree; The folded angle of the starting point of described circular-arc shoulder and terminal and bottom mid point line is 5 degree to 10 degree; The folded angle of the starting point of described side and terminal and bottom mid point line is 40 degree to 45 degree.
4. reflective secondary lens as claimed in claim 1, it is characterized in that: described side is that the first of ，Gai side, two-period form side is straight line, and second portion is circular arc, this first is connected with described shoulder, and this second portion is connected with described first surface.
5. reflective secondary lens as claimed in claim 4, is characterized in that: the straight line of described first outwards becomes 5 °-10 ° with vertical direction, length is 2.5mm-3mm.
6. reflective secondary lens as claimed in claim 4, is characterized in that: the crown height of described second portion is 2mm-3mm, and radius is 2.2mm-2.5mm.
7. reflective secondary lens as claimed in claim 1, is characterized in that: described side is that two parts of ，Gai side, two-period form side are respectively two slope over 10 positive and negative straight line each other.
8. reflective secondary lens as claimed in claim 1, is characterized in that: described first surface is provided with microstructure, makes the reflection angle of reflection ray present irregularities, to increase light homogeneity during outgoing from lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310547372.1A CN103543481A (en) | 2013-11-06 | 2013-11-06 | Reflection-type second lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310547372.1A CN103543481A (en) | 2013-11-06 | 2013-11-06 | Reflection-type second lens |
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| Publication Number | Publication Date |
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| CN103543481A true CN103543481A (en) | 2014-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310547372.1A Pending CN103543481A (en) | 2013-11-06 | 2013-11-06 | Reflection-type second lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925557A (en) * | 2014-03-26 | 2014-07-16 | 佛山市中山大学研究院 | Uniform light lens and LED light source module with same |
| CN103994396A (en) * | 2014-05-14 | 2014-08-20 | 郑睿韬 | LED secondary refraction and reflection lens for direct lighting type backlight source |
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| CN1904650A (en) * | 2005-07-26 | 2007-01-31 | 三星电子株式会社 | Optical lens, optical assembly, backlight assembly, display device, and method thereof |
| TW201027130A (en) * | 2010-03-16 | 2010-07-16 | Cal Comp Electronics & Comm Co | Lens structure |
| CN102062349A (en) * | 2010-09-07 | 2011-05-18 | 上海三思电子工程有限公司 | Side-light panoramic lens for LED |
| CN103277739A (en) * | 2013-04-26 | 2013-09-04 | 易美芯光（北京）科技有限公司 | Optical lens |
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2013
- 2013-11-06 CN CN201310547372.1A patent/CN103543481A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1904650A (en) * | 2005-07-26 | 2007-01-31 | 三星电子株式会社 | Optical lens, optical assembly, backlight assembly, display device, and method thereof |
| TW201027130A (en) * | 2010-03-16 | 2010-07-16 | Cal Comp Electronics & Comm Co | Lens structure |
| CN102062349A (en) * | 2010-09-07 | 2011-05-18 | 上海三思电子工程有限公司 | Side-light panoramic lens for LED |
| CN103277739A (en) * | 2013-04-26 | 2013-09-04 | 易美芯光（北京）科技有限公司 | Optical lens |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925557A (en) * | 2014-03-26 | 2014-07-16 | 佛山市中山大学研究院 | Uniform light lens and LED light source module with same |
| CN103925557B (en) * | 2014-03-26 | 2016-06-29 | 佛山市中山大学研究院 | Even optical lens and include the LED light source module of this even optical lens |
| CN103994396A (en) * | 2014-05-14 | 2014-08-20 | 郑睿韬 | LED secondary refraction and reflection lens for direct lighting type backlight source |
| CN103994396B (en) * | 2014-05-14 | 2017-07-11 | 郑睿韬 | A kind of bis- refraction-reflection lens of LED for downward back radiant |
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Application publication date: 20140129 |