CN101320102A - Light guide plate structure with multiple lens light incident surface - Google Patents
Light guide plate structure with multiple lens light incident surface Download PDFInfo
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- CN101320102A CN101320102A CNA2007101059799A CN200710105979A CN101320102A CN 101320102 A CN101320102 A CN 101320102A CN A2007101059799 A CNA2007101059799 A CN A2007101059799A CN 200710105979 A CN200710105979 A CN 200710105979A CN 101320102 A CN101320102 A CN 101320102A
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Abstract
A light guide plate structure with multiple lens light incident surfaces converts light emitted by a Light Emitting Diode (LED) into a surface light source through a light guide plate. The light guide plate is provided with a plurality of lens groups which are repeatedly arranged on the light incoming surface close to the LED light source, each lens group comprises a main lens and a plurality of side wing lenses which are arranged at two sides of the main lens along with the main lens, wherein each side wing lens comprises a plane and an arc surface, and therefore, by utilizing the lens groups which are repeatedly arranged, the scattering angle of the incident light of the LED in the light guide plate can be effectively enlarged, and the peripheral total reflected light can be collected for recycling, so that the light and shade phenomenon of the light incoming side in the light guide plate can be reduced, the utilization efficiency of a light source can be improved, and the more uniform optical quality and taste of the backlight module can be provided.
Description
Technical field
Innovation on the relevant light guide plate of the present invention, especially refer to a kind of light inlet scattering angle of incident ray in light guide plate that enlarges led light source, total reflection light around also can collecting simultaneously utilizes again, can effectively reduce light guide plate light inlet side light and shade phenomenon and improve the utilization ratio of light source, so that more a kind of light conducting plate structure and method for making thereof with multiple lens incidence surface of uniform optical quality and taste of module backlight to be provided.
Background technology
LCD LCD is because be the lithographic plate formula, so have the advantage that volume is flat and be convenient for carrying, become the main flow of monitor market, greatly employing is all arranged on it to TV, the little electronic product of using display screen to the every needs of mobile phone, because LCD is not the display device of self-luminosity, must reach display effect by external light source, general LCD adopts module backlight, provide liquid crystal panel evenly, the light source of high brightness.In recent years along with LCD is used more and more widely, demand is also more and more big, under the trend that requires high-quality, GOOD TASTE and low price, the market demands that module backlight will be considered lightweight, slimming, low power consumption, high brightness and reduce cost, for remaining on the competitive power of future market, its associated fabrication techniques also constantly promotes, and in the industry cycle constantly actively studies carefully and gives, and has derived many patent cases of getting permission.
The ultimate principle system of module backlight is with the similar linear light sources of similarity light source or the cold-cathode tube CCFL of light-emittingdiode LED, by a slice light guide plate and the various blooming piece on it in addition, above two kinds of light sources are changed into a product of the area source of high brightness and homogeneous briliancy.Because part diaphragm function is in atomizing or astigmatism (as diffusion barrier sheet), there is the part diaphragm to have light-focusing function in addition as (BEF), therefore light guide plate will be the mechanism of main conversion light source, allowing the light source after transforming be launched by the exiting surface of light guide plate equably, is element indispensable in the module backlight therefore.
When adopting CCFL as light source, normal kenel with the site is used as shifting to new management mechanisms of light source on its reflecting surface, the site is the image that a protruding point or depression hole are formed, the principle of network point distribution is the zone that can arrive easily at incident ray, the site arranges that density is low, and in zone that incident ray is not easy to arrive, the site arranges that density just must improve, therefore common phenomena is to make less in the site near light source place unit area, allow most incident ray can not be easy to scattering, and have an opportunity to arrive the distal-most end of light guide plate by site institute; And will make bigger away from site in the unit area at light source place, make incident ray be scattered at far-end, and causing the incident ray that enters light guide plate can be equably to leave from the exiting surface of light guide plate, the unanimity that the light number that its unit area is left is tried one's best reaches the purpose of uniform brilliance.And the incidence surface of light guide plate often adopts the polishing minute surface, because air is different with the refraction coefficient of plastic material, incident ray enters the angle of the light guide plate institute scattering that plastic material makes on the contrary than little at air by air, but because the linear light sorurce characteristic of CCFL, diminish this problem and not serious of scattering angle, but when using LED as light source, the scattering angle that enters light guide plate diminishes, the expression incident ray distributes and concentrates, incident ray can't leave light guide plate part exiting surface equably, and this problem just has its seriousness.
Light-emittingdiode LED has that volume is little, power consumption is little, meet environmental protection requirement again, be well suited for being used as the light source of module backlight, electronics and electric hole that its principle of luminosity is in diode to be produced, meeting combination in the PNJunction zone, and the generation photon sees through encapsulation technology to allow the lighting kenel of LED present the pyramidal illuminating source that a drift angle is about 120 degree, sees Fig. 1, and the single LEDs incident ray of breakthrough enters in the light guide plate, and its scattering angle is because the refraction cause can diminish; Generally require the module backlight of high briliancy in addition, it is the light inlet side that the LED of employing more than two is configured in light guide plate, the pyramid of adjacent two LEDs light scattering overlaps to distinguish and just has the area that can't shine with respect to the optic angle awl, and visually tangible clear zone of generation and dark space, this visually have zonal bright, dark areas to change existing picture, forms the inharmonious of vision, and reduced visual taste, the Japanese is referred to as Mura, so necessity of further improvement is arranged.
In addition, No. 246621 used light guide plate of a kind of LCD backlight module of TW patent announcement M are a typical example, wherein this light guide plate is to be made by optical grade acryl (PMMA) or polycarbonate pc (PC), the degree that is evenly distributed for the briliancy of improving the light guide plate glazed thread, some holes corresponding to light source are made at the proximal edge place of light guide plate, install the geometric form steel column additional at mould and behind ejection formation, form hole how much, the size of these holes, geometric configuration, position and quantity can be depending on the briliancy of degree of uniformity and light source condition (pointolite light guide plate desires to reach to(for) incident ray, line source), operating parameters such as light source number and adjust change, when shining light guide plate with special angle by the light that light source sent, also having irradiate light goes in the set hole in light guide plate edge, reflect and in these holes, produce, the phenomenon of refraction and scattering, thereby can make former incident ray produce diffusion effect, be distributed in the whole areal extent of this light guide plate with making its energy even, the uniformity coefficient of the incident ray of this light guide plate significantly can be promoted, therefore, can significantly improve the image display quality and the effect of the screen picture of LCD display panel.
Paper " Design and optimization of optical components using geneticalgorithms " is published in Opt.Eng.43 (7) abroad, July 2004, Pp1643-1646, mentioned an isosceles ladder type light guide plate, light source is positioned at the minor face of ladder type, the author utilizes the computer simulation technology at light guide plate internal mold draw up the number difference to be arranged, various geometric configuratioies, the hole that size is different, to seek the number of one group of the best, shape, the combination of size hole, the position can be distributed to equably the long limit of ladder type far-end at the light source of minor face, therefore the luminance variations amount that is measured by place, the long limit of light guide plate far-end is little, and the result improves image display quality.
More than the common denominator of two precedents be to have hole in light guide plate inside, therefore will have the shortcoming of following narration: (1) incident ray is being passed through when having the medium of different refraction coefficients, can produce phenomenons such as reflection, refraction and scattering by the intersection between medium, therefore incident ray may be revealed away by the intersection between medium, cause a bright area on the contrary, this measure not only reduces the service efficiency of light source, also destroys the vision taste simultaneously.(2) because hole is positioned at the inside of light guide plate, therefore limited processing mode, and the selectivity of material, more than two precedents all be to use the plastic rubber ejaculate molding mode to make light guide plate, employed mould manufacturing adds man-hour also can be very complicated, the mould volume also can increase, processing charges increase thereupon, during the finished product demoulding simultaneously moving part must be arranged, also will reduce the serviceable life of mould.
For improving this problem, increase scattering angle, so it makes many circular arc lens pillars in the face of the LED place in advanced light guide plate, see Fig. 3.Fig. 4 then is the graph of a relation of its incident ray intensity and angle, and block curve is represented along the variation of light guide plate direction incident ray intensity, and dashed curve is represented to change computer analoging figure along light guide plate Width intensity of incident light.These lens can have various different curvature according to the requirement of module optics backlight and mechanism design, by this, allow after the light source elder generation line focusing that enters light guide plate, after focus is intersected, scatter to other places of light guide plate, because the circular arc lens pillar is the incidence surface in light guide plate, so the mould design easily.
Only, at present because the more progress of the Science and Technology Day of pointolite LED, with under the volume its luminous luminance brightness will be more and more higher, if using known its light inlet side of light guide plate only is the convex row lens of a plane or single shape, technically obviously be not enough to incident ray is scattered to bigger angle, and its near the led light source place bright, dark areas will be more obvious, causes the bad of vision taste, so necessity of further improvement is arranged.
Because of Given this, the inventor succeeds in developing the present invention finally after research improvement in many ways.
Summary of the invention
Fundamental purpose of the present invention is, improves the vision taste of module backlight.By the multiple lens structure of the present invention in light guide plate light inlet side, expansion is entered the scattering angle of light guide plate by the LED emitted light beams, total reflection light around this multiple lens structure also can be collected simultaneously utilizes again, therefore can effectively reduce the light and shade phenomenon of light guide plate light inlet side and improve the utilization ratio of light source, so that the more module backlight of uniformly light-emitting quality to be provided.
For reaching aforesaid purpose, a kind of light conducting plate structure that the present invention is designed with multiple lens incidence surface, system enlarges the scattering angle of LED as best one can, it is by on the incidence surface of led light source, lens combination with several repeated configuration, this each lens combination comprises a main lens, and several follow several flank lens of establishing on its both sides to constitute, wherein, these each flank lens are made of a plane and an arc surface.
By this, utilize this multiple configuration lens combination, can effectively enlarge the scattering angle of LED, the total reflection light around also can collecting simultaneously utilizes again, to reduce the light and shade phenomenon and to improve the utilization ratio of light, provides module backlight more uniform optical quality.
For enabling further to understand constitution content of the present invention and other characteristics, lift the present invention now than specific embodiment, and the embodiment of conjunction with figs. describes as described below in detail.
Description of drawings
Fig. 1: be the luminous synoptic diagram of LED.
Fig. 2: be that the LED incident ray enters light guide plate refraction synoptic diagram by air.
Fig. 3: be habit formula light guide plate and the local cut-away view that amplifies thereof.
Fig. 4: be habit formula light guide plate incident ray intensity and angular relationship figure.
Fig. 5: be light guide plate of the present invention and the local cut-away view that amplifies thereof.
Fig. 6: be idealized light guide plate of the present invention and the local cut-away view that amplifies thereof.
Fig. 7: be the application synoptic diagram that light guide plate main lens of the present invention is set as concavees lens.
Fig. 8: be the application synoptic diagram that main lens of the present invention is set as convex lens.
Fig. 9: be light guide plate incident ray intensity of the present invention and angular relationship figure.
Figure 10: the synoptic diagram that is flank lens number changeable of the present invention.
Figure 11: be the synoptic diagram that flank lens number of the present invention is asymmetric configuration.
Embodiment
As Fig. 5～shown in Figure 11, a kind of light conducting plate structure that the present invention is designed with multiple lens incidence surface, this light guide plate 1 changes into led light source the mechanism of planar light source, it is near on the incidence surface 11 in LED 5 lamp sources, lens combination 2 with several repeated configuration, this each lens combination 2 comprises a main lens 21, and several follow several flank lens 22 of establishing on its both sides to constitute, wherein, these each flank lens 22 are made of a plane 23 and an arc surface 24, by this, utilize the lens combination 2 of this multiple configuration, can effectively enlarge the incident ray scattering angle that LED 5 enters light guide plate 1, the total reflection light around also can collecting simultaneously utilizes again, to reduce light guide plate near near the light and shade phenomenon LED and improve the utilization ratio of light source, provide module backlight more uniform optical quality.
During enforcement, as Fig. 6～shown in Figure 8, this main lens 21 can be convex lens or concavees lens all can, and the height of its flank lens 22 is at least more than 1/3rd of main lens 21 height, flank lens 22 are near the plane 23 of main lens 21 simultaneously, can be considered in the manufacturing process error as a straight line, the horizontal sextant angle of this line segment is 75 °～115 °, and its lens combination 2 each turning points also may present the fillet shape because of processing and the process technology limit when making in addition.
The manufacturing materials of this light guide plate 1 can be selected from any plastic material and glass material all can again, it is characterized in that the selected materials the best is, refraction coefficient in the spectral range of visible light (refraction coefficient) is between 1.1 to 2.5, and refraction attenuation coefficient (extinguishing coefficient) is less than 0.1.
In addition, the flank lens 22 that its each main lens 21 both sides are followed during manufacturing can be left and right mirror and be symmetrically distributed, and its number number can arbitrarily be established, but can be 10 at most.And its each lens combination 2 wherein can be provided with the continuous space of a planar lens 25 at interval.
By this, see also Fig. 5～shown in Figure 9, light guide plate 1 of the present invention is because be provided with multiple lens group 2 on incidence surface 11, it is except the main lens 21 that a circular arc column is arranged, be adjacent to its other circular arc flank lens 22 that also have different curvature, not only can utilize refraction principle expansion diffusion angle, carried out recycling by the light of total reflection around also can collecting simultaneously, improve the utilization ratio of light, even because the progress of LED 5 science and technology, luminous luminance brightness is more and more higher, but use the mode of multiple lens group 2 designs of the present invention, can effectively reduce the light and shade phenomenon of light guide plate 1 near LED light inlet side, provide module backlight more uniform optical quality, and can not produce too significant disadvantages of habit formula structure light and shade zone, when the dotted portion of comparison diagram 9 and Fig. 4 just can clearly be found, in the incident ray intensity of Fig. 9 in the amplification that distributes of the Width of light guide plate 1.
In addition, see also Figure 10, shown in Figure 11, for the more effective augmentation of range of application that makes this product, the anglec of rotation that adapts to the different brightening film sheets in light guide plate 1 top (figure does not show), the number of the flank lens 22 of its main lens 21 both sides also can increase and decrease adjustment relatively, or also can establish and be asymmetric number distribute (as Figure 11), so can be in order to the light beam proportioning of guiding LED incident ray brightness different proportion, reduce near the chiaroscuro effect on the LED place light guide plate 1, reach the purpose that improves module optical quality backlight.
Above-mentioned specific embodiment is to be used for describing in detail purpose of the present invention, feature and effect, only be part embodiment of the present invention, when not limiting practical range of the present invention with this, all personages who is familiar with this type of skill, according to the above description, and according to the conversion or the modification of the equivalence of doing on contained constructional device feature of the application's claim and the function, its essence does not detach spiritual category person of the present invention, all should be included in the patent right scope of this case.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101059799A CN101320102A (en) | 2007-06-05 | 2007-06-05 | Light guide plate structure with multiple lens light incident surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101059799A CN101320102A (en) | 2007-06-05 | 2007-06-05 | Light guide plate structure with multiple lens light incident surface |
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| CN101320102A true CN101320102A (en) | 2008-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007101059799A Pending CN101320102A (en) | 2007-06-05 | 2007-06-05 | Light guide plate structure with multiple lens light incident surface |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8353614B2 (en) | 2009-05-08 | 2013-01-15 | Au Optronics Corporation | Backlight unit |
| CN112363352A (en) * | 2020-12-10 | 2021-02-12 | 福州大学 | Quantum dot optical coupling structure applied to side-in backlight module and manufacturing method |
-
2007
- 2007-06-05 CN CNA2007101059799A patent/CN101320102A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8353614B2 (en) | 2009-05-08 | 2013-01-15 | Au Optronics Corporation | Backlight unit |
| CN112363352A (en) * | 2020-12-10 | 2021-02-12 | 福州大学 | Quantum dot optical coupling structure applied to side-in backlight module and manufacturing method |
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