CN100529878C - Light-negative moulding set - Google Patents
Light-negative moulding set Download PDFInfo
- Publication number
- CN100529878C CN100529878C CNB2005100360436A CN200510036043A CN100529878C CN 100529878 C CN100529878 C CN 100529878C CN B2005100360436 A CNB2005100360436 A CN B2005100360436A CN 200510036043 A CN200510036043 A CN 200510036043A CN 100529878 C CN100529878 C CN 100529878C
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- light
- guide plate
- light guide
- module backlight
- light source
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Abstract
This invention supplies a back light module, which at least concludes one illuminant and one light guide plate. This light guide plate has a light-entry surface and a light-outward surface that next to the light-entry surface. This back light module also concludes at least a multireflection device that can make light beam emitted by the illuminant couple to beam path of light-entry surface. Through this reflection device, the angle of departure of illuminant is enlarged. This can slake the dark band that is generated when light enter into light guide plate. This can increase luminance of the back light module and make the structure simplify.
Description
[technical field]
The invention relates to a kind of module backlight.
[background technology]
In recent years, the flat display apparatus development has been widely used in fields such as personal computer, TV, mobile communication and consumption electronic products rapidly, becomes a large platform of infotech.Simultaneously, electronic product improves constantly the requirement of module backlight in the flat display apparatus (as liquid crystal indicator), and high brightness, lightening, low-cost, low energy consumption, high life become the developing direction of module backlight.
According to light source placement location difference, module backlight can be divided into straight-down negative and side-mounted two kinds.Straight-down negative is meant and light source is placed under the light guide plate direct illumination light guide plate.The shortcoming of this type of module backlight is that thickness is bigger, does not meet current consumer to its light demand.And side-mounted module backlight generally places light source the light guide plate side, light is coupled into light guide plate by the side, the light that enters light guide plate will be propagated in light guide plate according to total reflection principle, when light runs into the microstructure (Pattern) on light guide plate surface, total reflection condition is destroyed, light penetrates from light guide plate is positive, by density, the microstructure design that varies in size, can make the light guide plate uniformly light-emitting.This side-mounted back light module unit structure is thin and light, adapts to the current market demand.
Yet no matter which kind of light source module backlight adopts place, these light sources all are confined to certain angle of divergence, and this angle of divergence is difficult to cover fully the incidence surface of light guide plate usually, thereby forms local blanking bar on the incidence surface of light guide plate.See also Fig. 1, for the blanking bar that contains two pointolites 11,11 ' module backlight 10 produces synoptic diagram.Because two pointolites 11,11 ' emergent ray space transmission all are a cone and distribute, this cone has certain cone angle, is light source 11,11 ' the light angle of divergence.When this two pointolite 11,11 ' emergent light are incident to a space plane, promptly during the incidence surface 122 of light guide plate 12, the zone 124,125 and 126 that this incidence surface 122 exists emergent light to arrive, this zone 124,125 and 126 is commonly called the blanking bar district.Thereby, in module 10 backlight, when light source 11,11 ' is incident to light guide plate 12, can there be blanking bar district 124,125 and 126 in this light guide plate 12, and because whole light guide plate 12 is corresponding with the main viewing area of a display panel usually, thereby blanking bar district 124,125 and 126 has a strong impact on the display brightness and the quality of display panel.
For eliminating blanking bar, usually make incidence surface or exiting surface form certain microstructure in the hope of eliminating blanking bar, as prior art by a plurality of projections that match with light source are set at incidence surface, perhaps form a plurality of triangle grooves or cavity, but, still have the blanking bar district to produce when light source is incident to incidence surface in these modes, these microstructures only can reduce and can't eliminate the generation of blanking bar fully, and when making, light guide plate need special design to have the mould of these microstructures or adopt other processing procedure to form these microstructures, thereby bring very big difficulty for the actual fabrication of the light guide plate that needs these microstructures, and increase the structure complexity of entire aphototropism mould.
In view of this, providing a kind of generation and the module backlight simple in structure that can eliminate blanking bar is necessary in fact.
[summary of the invention]
Below, will a kind of module backlight be described with embodiment.
For realizing foregoing, a kind of module backlight is provided, it comprises an at least one light source and a light guide plate; Described light guide plate has an incidence surface and one and the adjacent exiting surface of described incidence surface; This module backlight also comprises is located at light beam coupling that described at least one light source the sends at least one repeatedly reflection unit to the light path of incidence surface, be used to enlarge the angle of divergence of described at least one light source, this repeatedly reflection unit be prism, this prism has the sensitive surface of accepting light beam of light source, with the vertical plane of the perpendicular adjacency of this sensitive surface and respectively with described sensitive surface and two adjacent reflectings surface of vertical plane, this vertical plane is relative with the incidence surface of this light guide plate, described at least one light source and this sensitive surface are oppositely arranged, and the light beam that this light source sends enters that the reflection through this two reflecting surface enters this light guide plate through this vertical plane again behind this sensitive surface.
Wherein, described repeatedly reflection unit comprises a pentagonal prism or a tetragonal prism.
Preferably, described two reflectings surface are coated with reflectance coating.
Preferably, described sensitive surface and vertical plane are adjacent the reflecting surface angle that connects and are respectively 112.5 °.
Preferably, the angle of described two reflectings surface is 45 °.
Preferably, described two reflectings surface have the equal length of side.
Preferably, the height of described repeatedly reflection unit equates with the incidence surface height of light guide plate.
The material of described repeatedly reflection unit is selected from organic glass or quartz glass.
Described light guide plate further comprises reflective surface and and described exiting surface adjacent a plurality of sides relative with described exiting surface.
The reflective surface of described light guide plate and a plurality of side are coated with reflectance coating.
The reflective surface of described light guide plate is formed with microstructure.
Compared with prior art, the module backlight that present embodiment provides is by being provided with reflection unit more than one time in the light beam that sends at the light source light path to the light guide plate, the light beam that is sent by light source is repeatedly repeatedly being reflected in the reflection unit respectively, make the angle of divergence of light source corresponding through repeatedly amplifying, thereby make the angle of divergence of light source obtain fully to amplify, can eliminate the blanking bar generation after light beam enters light guide plate.Thereby present embodiment can be eliminated blanking bar fully with reflection unit repeatedly and produce, and improves the efficiency of light energy utilization, increases the brightness of illumination of module backlight, and it is simplified the structure.
[description of drawings]
Fig. 1 is that the blanking bar of the module backlight of prior art produces synoptic diagram.
Fig. 2 is the module planar structure synoptic diagram backlight of the embodiment of the technical program.
Fig. 3 is the module side view backlight of the embodiment of the technical program.
Fig. 4 is the perspective view of reflection unit repeatedly among the embodiment of the technical program.
Fig. 5 is the planar structure synoptic diagram of reflection unit repeatedly among the technical program embodiment.
[embodiment]
Below in conjunction with accompanying drawing the technical program is described in further detail.
Please consult Fig. 2 and Fig. 3 together, the back light module unit structure synoptic diagram that provides for present embodiment.This module 20 backlight comprise two light sources 21,21 ', one light guide plate 22 and with light source 21,21 ' corresponding two reflection unit repeatedly.Wherein, described repeatedly reflection unit adopts pentagonal prism 23,23 ', and two pentagonal prisms 23,23 ' are arranged in light beam that two light sources 21,21 ' the send light path to light guide plate 22.
Usually, light source 21,21 ' can adopt pointolite or line source, and as fluorescent tube, cold cathode fluorescent lamp or light emitting diode etc., present embodiment adopts two light emitting diodes as two pointolites 21,21 '.
This light guide plate 22 has an incidence surface 220 and one and the adjacent exiting surface 222 of described incidence surface 220, and at this moment, two light sources 21,21 ' place the same side with respect to incidence surface 220.The optional self-induced transparency polymer resin of the material of this light guide plate 22 specifically can be selected from following material: synthetic resin, polycarbonate, polystyrene, polymethylmethacrylate, noncrystalline cyclic olefine polymkeric substance, polypropylene, tygon or thermoplastic polyester etc.
For increasing the light-emitting uniformity and the efficiency of light energy utilization of light guide plate 22, can further on the reflective surface 224 of light guide plate 22, form microstructure 228, comprise groove or lattice point structure, groove can adopt structures such as V-type groove, U type groove, groove, and present embodiment adopts the V-type groove.These microstructures 228 are parallel to each other in incidence surface 220.The degree of depth of microstructure 228 generally is no more than 100 microns, and, can be by apart from the intensive more series arrangement of light source distribution far away more.In addition, on the side 226 that reflective surface 224 reaches and this reflective surface is adjacent of light guide plate 22, plate reflectance coating, can prevent that light beam from spilling with side 226 from the reflective surface 224 of light guide plate 22.
This pentagonal prism 23,23 ' can be selected transparent materials such as organic glass or quartz glass for use.Preferably, this pentagonal prism 23,23 ' part outside surface are coated with reflectance coating 230,230 ', be used for the light beam that reflection source 21,21 ' sends, for example aluminium film or copper film, also can be at its outside surface reflecting optics that reclines, make that the light beam that light source 21,21 ' sends can be inner through repeatedly reflection at pentagonal prism 23,23 ', can enlarge light source 21,21 ' the angle of divergence, produce thereby eliminate blanking bar.As shown in Figure 3, after the light beam that light source 21,21 ' sends reflects more than twice through pentagonal prism, its dispersion angle increases greatly, the light beam of dispersing then is coupled to incidence surface 220 again, at this moment, incidence surface 220 no longer includes blanking bar and produces, and can make light beam evenly penetrate the brightness that improves module 20 backlight from whole exiting surface 222.
Please consult Fig. 4 and Fig. 5 together, be pentagonal prism 23 schematic perspective views and the floor map of present embodiment employing.It is pentagonal prism that the pentagonal prism 23 of present embodiment adopts cross sections, except that having a sensitive surface 231, also have one with the vertical plane 232 of the perpendicular adjacency of this sensitive surface, this vertical plane 232 is relative with the incidence surface 220 of light guide plate 22.In addition, pentagonal prism 23 also has respectively the reflecting surface 233,234 adjacent with sensitive surface 231 and vertical plane 232, is used to reflect the light beam from light source 21.Preferably, the angle of reflecting surface 233,234
It is 45 °, be respectively 112.5 ° with the adjacent sensitive surface 231 or the angle theta of vertical plane 232, and, sensitive surface 231 preferably equates with length of side L1, the L2 of vertical plane 232, and length of side L3, the L4 of two reflectings surface 233,234 are also preferably equal, when length of side L3, the L4 of two reflectings surface 233,234 extend to long enough relatively, as shown in phantom in Figure 5, this pentagonal prism becomes tetragonal prism, and the optical effect of this tetragonal prism is equal to pentagonal prism 23.The incidence surface 220 height h of high H of the post of pentagonal prism 23 and light guide plate 22 adapt, for example H 〉=h (please in conjunction with consulting Fig. 3).When light beam enters pentagonal prism 23, repeatedly reflection will take place in it in pentagonal prism 23, up to penetrating from pentagonal prism 23, enter the incidence surface 220 (figure does not show) of light guide plate 22 again.
As mentioned above, the module backlight 20 that present embodiment provides is by being provided with pentagonal prism 23,23 ' in the light beam that sends at light source 21, the 21 ' light path to the light guide plate 22, make the light beam that sends by light source 21,21 ' respectively at repeatedly reflecting in the pentagonal prism 23,23 ', can make by light source 21, the 21 ' angle of divergence corresponding through repeatedly enlarging, finally make two light sources 21,21 ' the angle of divergence obtain fully to amplify, to eliminate the blanking bar that forms when light beam coupling is gone into light guide plate.Thereby this enforcement only need utilize pentagonal prism 23,23 ' can eliminate blanking bar fully, to improve the efficiency of light energy utilization, increases the brightness of illumination of module 20 backlight, and it is simplified the structure.
But the module backlight of the technical program is not limited to the described structure of the foregoing description.For example, when only adopting a light source, also only need a repeatedly reflection unit corresponding with it, and repeatedly reflection unit is not limited to above-mentioned pentagonal prism shape, also alternative hollow transparent prism shape to combine by a plurality of prismatic lenses, as long as the light beam that enters in the prism is repeatedly reflected, get final product with the angle of divergence that enlarges light source.
Claims (11)
1. a module backlight comprises an at least one light source and a light guide plate, and described light guide plate has an incidence surface and one and the adjacent exiting surface of described incidence surface; It is characterized in that: described module backlight also comprises is located at light beam coupling that described at least one light source the sends at least one repeatedly reflection unit to the light path of incidence surface, be used to enlarge the angle of divergence of described at least one light source, this repeatedly reflection unit be prism, this prism has the sensitive surface of accepting light beam of light source, with the vertical plane of the perpendicular adjacency of this sensitive surface and respectively with described sensitive surface and two adjacent reflectings surface of vertical plane, this vertical plane is relative with the incidence surface of this light guide plate, described at least one light source and this sensitive surface are oppositely arranged, and the light beam that this light source sends enters that the reflection through this two reflecting surface enters this light guide plate through this vertical plane again behind this sensitive surface.
2. module backlight as claimed in claim 1 is characterized in that described repeatedly reflection unit comprises a pentagonal prism or tetragonal prism.
3. module backlight as claimed in claim 1 is characterized in that described two reflectings surface are coated with reflectance coating.
4. module backlight as claimed in claim 1 is characterized in that described sensitive surface and vertical plane and is adjacent the reflecting surface angle that connects being respectively 112.5 °.
5. module backlight as claimed in claim 1, the angle that it is characterized in that described two reflectings surface is 45 °.
6. module backlight as claimed in claim 1 is characterized in that described two reflectings surface have the equal length of side.
7. module backlight as claimed in claim 1 is characterized in that the height of described repeatedly reflection unit equates with the incidence surface height of light guide plate.
8. module backlight as claimed in claim 1 is characterized in that the material of described repeatedly reflection unit is selected from organic glass or quartz glass.
9. module backlight as claimed in claim 1 is characterized in that described light guide plate further comprises reflective surface and and described exiting surface adjacent a plurality of sides relative with described exiting surface.
10. module backlight as claimed in claim 9 is characterized in that the reflective surface of described light guide plate and a plurality of side are coated with reflectance coating.
11. module backlight as claimed in claim 10 is characterized in that the reflective surface of described light guide plate is formed with microstructure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100360436A CN100529878C (en) | 2005-07-15 | 2005-07-15 | Light-negative moulding set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100360436A CN100529878C (en) | 2005-07-15 | 2005-07-15 | Light-negative moulding set |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1896831A CN1896831A (en) | 2007-01-17 |
| CN100529878C true CN100529878C (en) | 2009-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100360436A Expired - Fee Related CN100529878C (en) | 2005-07-15 | 2005-07-15 | Light-negative moulding set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100529878C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI476352B (en) * | 2012-04-05 | 2015-03-11 | Radiant Opto Electronics Corp | Lighting fixture |
| CN104656183B (en) * | 2015-03-10 | 2017-09-01 | 京东方科技集团股份有限公司 | Light guide plate assembly and display device |
| CN104730619A (en) * | 2015-03-27 | 2015-06-24 | 深圳市华星光电技术有限公司 | Light guide plate, backlight module with same and liquid crystal display |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2658760Y (en) * | 2003-09-08 | 2004-11-24 | 三和企业股份有限公司 | Back light type light guide plate |
| CN2682444Y (en) * | 2004-02-03 | 2005-03-02 | 三和企业股份有限公司 | Backlight type light conducting plate |
-
2005
- 2005-07-15 CN CNB2005100360436A patent/CN100529878C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2658760Y (en) * | 2003-09-08 | 2004-11-24 | 三和企业股份有限公司 | Back light type light guide plate |
| CN2682444Y (en) * | 2004-02-03 | 2005-03-02 | 三和企业股份有限公司 | Backlight type light conducting plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1896831A (en) | 2007-01-17 |
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