CN103226261A - Two-dimensional collimating backlight module used for LCD (liquid crystal display) - Google Patents
Two-dimensional collimating backlight module used for LCD (liquid crystal display) Download PDFInfo
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- CN103226261A CN103226261A CN2013101004062A CN201310100406A CN103226261A CN 103226261 A CN103226261 A CN 103226261A CN 2013101004062 A CN2013101004062 A CN 2013101004062A CN 201310100406 A CN201310100406 A CN 201310100406A CN 103226261 A CN103226261 A CN 103226261A
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Abstract
The invention discloses a two-dimensional collimating backlight module used for an LCD, which comprises a light source, a wedge film, a reflecting film and a prism film, and is characterized in that the wedge film is a polygonal wedged body which consists of a first light incoming surface, a first light-outgoing surface, a second light-outgoing surface, a first wedged end surface and a second wedged end surface; the first light-outgoing surface is a plane; the second light-outgoing surface is a curved surface or a non-planar surface which comprises more than two planes formed by seamless splicing; included angles between the first wedged end surface and the first light-incoming surface and between the second wedged end surface and the first light-incoming surface are larger than 100 degrees; the light source is arranged on one side of the first light-incoming surface; the prism film is arranged on one side of the first light-outgoing surface; and the reflecting film is arranged on one side of the second light-outgoing surface. The two-dimensional collimating backlight module used for the LCD has the advantages that a two-dimensional collimating surface light source can be produced, a produced parallel light beam is good in collimation, and the light source utilization rate is very high.
Description
Technical field
The present invention relates to a kind of backlight liquid crystal display module that is used for, especially relate to a kind of two-dimensional collimation module backlight that is used for LCD.
Background technology
Since the seventies in last century, LCD is widely used because of having advantages such as cost is low, resolution is high, bright in luster, and its application in electronic equipment is almost ubiquitous, from undersized watch to large-sized TV.The LCD that develops into has now had higher resolution, compact conformation, high brightness and low cost.Yet although passed through the development and progress of four more than ten years, LCD is because the restriction of the backlight deficiency of its use, has still that the light source utilization rate is low, a poor contrast and produce problem such as colour cast.
Itself does not have the characteristics of luminescence liquid crystal in the panel of LCD, and it utilizes module backlight that light source is provided, and reaches the display display effect.Usually backlight adopts light emitting diode (LED) or cathode fluorescent tube (CCFL) as light source, and the light that light source sends is coupled into display through light guide plate.But the dispersion angle of light source is bigger, the actual light guide plate (LGP) that enters) be utilized energy shortage 10%, cause the efficient of whole display to reduce.In addition because dispersion angle backlight is bigger, cause light to enter can producing behind the display crosstalking (crosstalk), contrast reduces.
Especially the development of HDTV (HDTV) is to the contrast of display in the development of large scale TV, and picture quality requires higher.With the normal perpendicular to LCDs is axle, LC is to the paraxial light utilization height from backlight, therefore if the dispersion angle of backlight is big, then the light source utilization factor can reduce, and wide-angle can cause contrast decline, light leak, color washout(colour cast from the light of axle) etc. problem.
Developed after 20th century be used for much that the individual uses such as small-size liquid crystal displays such as mobile phone, digital camera, counter, wrist-watches, the large-sized relatively panel of the Pixel Dimensions of these undersized its liquid crystal panels of display is littler, therefore crosstalk for avoiding, improve contrast, its collimation performance requirement to backlight is higher.This just needs backlight is a uniform collimation plane light source of two dimension.
Yet, the backlight that nearly all liquid crystal display on the existing market is used is not a collimated backlight, all have the bigger angle of divergence, and the light source utilization factor is very low, the diverging light of wide-angle causes whole LCD contrast to descend after passing LCDs, and has the problem of crosstalking.
Chinese patent (201210026819.6) has proposed a kind of existing back light module unit structure that can produce collimated light, and its structure comprises light source, light source reflecting housing, wedge film, reflectance coating and prism film.Wherein wedge film is leg-of-mutton sphenoid, is positioned at the dead ahead of described light source, and the diverging light that is used for different angles that light source is sent pools the parallel beam outgoing of the contiguous angle of total reflection by total reflection repeatedly.Wherein reflectance coating is positioned over exiting surface one side of wedge film, is used to light is reused in the reflected back wedge film again.Prism film is positioned at the opposing party of described wedge film exiting surface, is used for the parallel beam with liquid crystal display is big incident angle from the wedge film outgoing is reflected parallel beam perpendicular to liquid crystal display.
Though the module backlight that this invention is introduced can provide a kind of collimated light, but only be on the one dimension direction, to carry out the optically focused collimation, can satisfy the demand of use for the bigger large size panel of Pixel Dimensions, but it is minimum for Pixel Dimensions, contrast requires very high again small-size liquid crystal displays, can not satisfy its requirement to backlight two-dimensional collimation degree.
Summary of the invention
At the problem that prior art module backlight can only collimate in the one dimension direction, the present invention proposes the two-dimensional collimation back light module unit structure that a kind of emergent light collimation is good, light utilization is high.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of two-dimensional collimation module backlight that is used for LCD, comprise light source, wedge film, reflectance coating and prism film, described wedge film be one by first incidence surface, first exiting surface, second exiting surface, the polygon sphenoid that the first wedge shape end face and the second wedge shape end face constitute, described first exiting surface is the plane, described second exiting surface is curved surface or the on-plane surface be made up of plural seamless spliced plane, angle between the described first wedge shape end face and described second wedge shape end face and the described incidence surface is greater than 100 degree, described light source is arranged on described first incidence surface, one side, described prism film is arranged on described first exiting surface, one side, and described reflectance coating is arranged on described second exiting surface, one side.
At least form an intersecting lens between described first exiting surface and described second exiting surface.
Described wedge film and described prism film are optical material, described reflectance coating surface metal-plated membrane or dielectric reflection film.
Key groove maximum in the sphenoid that forms between described first exiting surface and described second exiting surface is smaller or equal to 10 °.
Described light source is close to described first incidence surface and is placed.
The reflecting surface of described reflectance coating and described second exiting surface are close to, and are used for the described wedge film of light reflected back of the described second exiting surface outgoing is reused.
The structure of described prism film is several circular arc parallelogram volume arrays that are arranged in order along the described first incidence surface normal direction, and the section of described circular arc parallelogram body is a parallelogram.
Described prism film comprises second incidence surface and the 3rd exiting surface that is parallel to each other, described second incidence surface is parallel with described first exiting surface, the light of the described first exiting surface outgoing enters described prism film from described second incidence surface, and the parallel beam with described second incidence surface is than big incident angle that described prism film will be penetrated by described wedge film first exiting surface reflects the parallel beam perpendicular to described the 3rd exiting surface to penetrate.
Compared with prior art, the invention has the advantages that to produce the two-dimensional collimation area source, and the parallel beam collimation that is produced is good, the light source utilization factor is very high.
Description of drawings
Fig. 1 is the cross-sectional structure synoptic diagram of prior art module backlight;
Fig. 2 is the structural representation of two-dimensional collimation of the present invention module backlight;
Fig. 3 is two-dimensional collimation of the present invention module plan structure backlight figure;
Fig. 4 is a two-dimensional collimation of the present invention module sectional structure chart backlight;
Fig. 5 is one of perspective view of wedge film of the present invention;
Fig. 6 be wedge film of the present invention perspective view two;
Fig. 7 is for constituting the perspective view of the circular arc parallelogram body of prism film among the present invention;
Fig. 8 is a wedge film bright dipping synoptic diagram of the present invention;
Fig. 9 is wedge film of the present invention and prism film principle of work synoptic diagram;
Figure 10 be according to Snell's law draw from the close reflectance curves of dredging of light to light;
Figure 11 is the emergent light synoptic diagram of two-dimensional collimation of the present invention module backlight.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
The invention provides a kind of module backlight that can produce two-dimensional collimation light, its structure as shown in Figure 2.Module backlight comprises light source 00, reflectance coating 10, wedge film 20 and prism film 30.Light source 00 is LED.Wedge film 20 is a polygon sphenoid that is made of first incidence surface 201, first exiting surface 202, second exiting surface 203, the first wedge shape end face 204 and the second wedge shape end face 205, wherein first incidence surface 201 is positioned at the thickest end of sphenoid, light source 00 is close to first incidence surface 201 and is placed, first exiting surface 202 and second exiting surface 203 are polygonal two bottom surfaces, and key groove α maximum in their the formed sphenoid is smaller or equal to 10 °.First exiting surface 202 is a plane, and second exiting surface 203 can be a spliced plane or a curved surface.Reflectance coating 10 is positioned at a side of second exiting surface 203, and its reflecting surface and second exiting surface 203 are close to, and is used for light reflected back wedge film 20 recyclings by 203 outgoing of second exiting surface.Prism film 30 is positioned at a side of first exiting surface 202, its structure is several circular arc parallelogram volume arrays that are arranged in order along first incidence surface, 201 normal directions, the section of circular arc parallelogram body is a parallelogram, prism film 30 comprises second incidence surface 301 and the 3rd exiting surface 304 that is parallel to each other, second incidence surface 301 is parallel with first exiting surface 202, the light of first exiting surface, 202 outgoing enters prism film 30 from second incidence surface 301, and prism film 30 will reflect the parallel beam perpendicular to the 3rd exiting surface 304 to penetrate by first exiting surface, 202 parallel beams that are than big incident angle with second incidence surface 301 that penetrate of wedge film 20.
Fig. 3 can see that for the schematic top plan view of two-dimensional collimation of the present invention module backlight prism film is several circular arc parallelogram volume arrays that are arranged in order along first incidence surface, 201 normal directions, and light source 00 is positioned on first incidence surface 201.
Fig. 4 is a two-dimensional collimation of the present invention module cross-sectional schematic backlight, and wedge film 20 sections are a similar leg-of-mutton sphenoid, and the prism film section is a parallelogram, and its unitized construction is similar to the prior art among the figure one.
Fig. 5 is one of perspective view of core component wedge film 20 of the present invention, and its structure is the polygon sphenoid.This sphenoid comprises first incidence surface 201, first exiting surface 202, second exiting surface 203, the first wedge shape end face 204 and the second wedge shape end face 205, perpendicular to first exiting surface, 202 directions, there be the thickest end and the thinnest end in sphenoid, and first incidence surface 201 is the side at place, the polygonal limit of the thickest end.Second exiting surface 203 is by two seamless spliced forming in plane.
Fig. 6 is core component wedge film 20 another kind of structural representations of the present invention, and its structure is the polygon sphenoid.This sphenoid comprises first incidence surface 201, first exiting surface 202, second exiting surface 203, the first wedge shape end face 204 and the second wedge shape end face 205, perpendicular to first exiting surface, 202 directions, there be the thickest end and the thinnest end in sphenoid, and first incidence surface 201 is the side at place, the polygonal limit of the thickest end.Second exiting surface 203 is a curved surface.
Fig. 7 is for constituting the structural representation of the circular arc parallelogram body of prism film 30 among the present invention, as can be seen from the figure, this circular arc parallelogram body comprises second incidence surface 301 and the 3rd exiting surface 304 that is parallel to each other, and its cross section is a parallelogram sturcutre.
Fig. 8 is the principle of work synoptic diagram of core component wedge film 20 of the present invention, the light of the different angles that light source sends is propagated in wedge film through total reflection repeatedly after entering wedge film, at last when incident angle in the medium during smaller or equal to the cirtical angle of total reflection light penetrate from first exiting surface 202 and second exiting surface 203 of wedge film.The effect of this wedge film is the diverging light with Vernonia parishii Hook angle that light source is sent and penetrates wedge film by the parallel beam that total reflection repeatedly is converged to the contiguous cirtical angle of total reflection.Light is penetrated by thin the bringing out of wedge film as seen from Figure 8.
Fig. 9 has elaborated a light through wedge film among the present invention and the light path track in the prism film.The principle of work of wedge film is based on Snell laws of refraction:
n
1sinθ
1=n
2sinθ
2
N in the formula
1Be the refractive index of medium 1, θ
1Be incident angle, n
2Be the refractive index of medium 2, θ
2Be the refraction angle.
Be bigger incident angle with light 04 with liquid crystal display from first exiting surface 202 of wedge film 20, do not satisfy the demand that liquid crystal display uses, need to add prism film 30 light is reflected into the normal incidence parallel beam vertical with liquid crystal display near cirtical angle of total reflection outgoing.Light 04 reflection that the reflecting surface 302 of prism film 30 will outgoing from wedge film 20 among above-mentioned Fig. 9, reflection ray is through vertical light 05 outgoing of the 3rd exiting surface 304 of prism film exiting surface 304 refraction back one-tenth and prism film 30.
For improving the utilization factor of light, avoid energy loss, require to satisfy two conditions from all light that wedge film 20 outgoing shine on the prism film 30: (1) all light must be through reflecting surface 302 reflections of prism film 30 after entering prism film 30; (2) all can not be shone on the opposite side reflecting surface 303 of prism film 30 by the light of reflecting surface 302 reflections of prism film 30.
Figure 11 is a two-dimensional collimation of the present invention module emergent light backlight synoptic diagram, as can be seen from the figure, diverging light by the wide-angle of light source 00 outgoing penetrates through becoming even collimation plane light beam after the structure of the present invention, it is in two dimensional surface, this outgoing beam all has the collimation height, the characteristics that the angle of divergence is little.
Claims (8)
1. two-dimensional collimation module backlight that is used for LCD, comprise light source, wedge film, reflectance coating and prism film, it is characterized in that described wedge film be one by first incidence surface, first exiting surface, second exiting surface, the polygon sphenoid that the first wedge shape end face and the second wedge shape end face constitute, described first exiting surface is the plane, described second exiting surface is curved surface or the on-plane surface be made up of plural seamless spliced plane, angle between the described first wedge shape end face and described second wedge shape end face and described first incidence surface is greater than 100 degree, described light source is arranged on described first incidence surface, one side, described prism film is arranged on described first exiting surface, one side, and described reflectance coating is arranged on described second exiting surface, one side.
2. a kind of two-dimensional collimation module backlight that is used for LCD as claimed in claim 1 is characterized in that forming an intersecting lens at least between described first exiting surface and described second exiting surface.
3. a kind of two-dimensional collimation module backlight that is used for LCD as claimed in claim 1 is characterized in that described wedge film and described prism film are optical material, described reflectance coating surface metal-plated membrane or dielectric reflection film.
4. a kind of two-dimensional collimation module backlight that is used for LCD as claimed in claim 1, key groove maximum in the sphenoid that it is characterized in that forming between described first exiting surface and described second exiting surface is smaller or equal to 10 °.
5. as the described a kind of two-dimensional collimation module backlight that is used for LCD of each claim in the claim 1～4, it is characterized in that described light source is close to described first incidence surface and places.
6. a kind of two-dimensional collimation module backlight that is used for LCD as claimed in claim 5, the reflecting surface and described second exiting surface that it is characterized in that described reflectance coating are close to, and are used for the described wedge film of light reflected back of the described second exiting surface outgoing is reused.
7. as the described a kind of two-dimensional collimation module backlight that is used for LCD of each claim in the claim 1～4, the structure that it is characterized in that described prism film is several circular arc parallelogram volume arrays that are arranged in order along the described first incidence surface normal direction, and the section of described circular arc parallelogram body is a parallelogram.
8. a kind of two-dimensional collimation module backlight that is used for LCD as claimed in claim 7, it is characterized in that described prism film comprises second incidence surface and the 3rd exiting surface that is parallel to each other, described second incidence surface is parallel with described first exiting surface, the light of the described first exiting surface outgoing enters described prism film from described second incidence surface, and the parallel beam with described second incidence surface is than big incident angle that described prism film will be penetrated by described wedge film first exiting surface reflects the parallel beam perpendicular to described the 3rd exiting surface to penetrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101004062A CN103226261A (en) | 2013-03-26 | 2013-03-26 | Two-dimensional collimating backlight module used for LCD (liquid crystal display) |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101004062A CN103226261A (en) | 2013-03-26 | 2013-03-26 | Two-dimensional collimating backlight module used for LCD (liquid crystal display) |
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| CN103226261A true CN103226261A (en) | 2013-07-31 |
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| CN2013101004062A Pending CN103226261A (en) | 2013-03-26 | 2013-03-26 | Two-dimensional collimating backlight module used for LCD (liquid crystal display) |
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Cited By (6)
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| CN107609456A (en) * | 2016-07-12 | 2018-01-19 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
| CN109212660A (en) * | 2018-10-26 | 2019-01-15 | 合肥京东方光电科技有限公司 | Leaded light component, light collimator assembly, backlight module and display device |
| CN110208895A (en) * | 2019-05-08 | 2019-09-06 | 苏州晶智科技有限公司 | A kind of clapboard and its backlight module for backlight module |
| CN110208983A (en) * | 2019-05-08 | 2019-09-06 | 苏州晶智科技有限公司 | A kind of side entrance back module |
| CN111771158A (en) * | 2019-01-31 | 2020-10-13 | 京东方科技集团股份有限公司 | Backlight source, backlight module and display device |
| WO2022127444A1 (en) * | 2020-12-15 | 2022-06-23 | 马鞍山晶智科技有限公司 | Anti-peeping backlight module |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107609456A (en) * | 2016-07-12 | 2018-01-19 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
| CN109212660A (en) * | 2018-10-26 | 2019-01-15 | 合肥京东方光电科技有限公司 | Leaded light component, light collimator assembly, backlight module and display device |
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| CN110208983A (en) * | 2019-05-08 | 2019-09-06 | 苏州晶智科技有限公司 | A kind of side entrance back module |
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| WO2022127444A1 (en) * | 2020-12-15 | 2022-06-23 | 马鞍山晶智科技有限公司 | Anti-peeping backlight module |
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Application publication date: 20130731 |