CN2736798Y - Light guide plate and backlight module - Google Patents
Light guide plate and backlight module Download PDFInfo
- Publication number
- CN2736798Y CN2736798Y CN 200420088763 CN200420088763U CN2736798Y CN 2736798 Y CN2736798 Y CN 2736798Y CN 200420088763 CN200420088763 CN 200420088763 CN 200420088763 U CN200420088763 U CN 200420088763U CN 2736798 Y CN2736798 Y CN 2736798Y
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- light guide
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- 229920003002 synthetic resin Polymers 0.000 description 2
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- 239000002184 metal Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
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- Light Guides In General And Applications Therefor (AREA)
- Planar Illumination Modules (AREA)
Abstract
The utility model relates to a light guide plate and a backlight module applied to liquid crystal display field. In order to solve the technical problem that an optical membrane needs to be added to the existing light guide plate to make the emergent light of the backlight module vertically exit, the light guide plate of the utility model comprises an incident surface, an emergent surface and a reflection surface with an increase reflected light membrane. Wherein, the reflection surface forms a plurality of V-type microstructures which bulge to the outer part of the light guide plate and which are consistent to the angle, the apical angle is 40 to 95 degrees, and the first and second bottom angles formed by the V-type microstructures and the surface where the reflection surface are positioned are 70 to 90 degrees and 15 to 50 degrees respectively. At least part of the light generated by a light source enters the light guide plate through the incident surface, and after reflected by the reflection surface, the light exits along the direction that is perpendicular with the emergent surface. Thus, the integration of the light guide plate and the light source can realize traditional functions of the backlight module, can simplify the system, and can enhance the performance. The utility model also provides the backlight module using the light guide plate.
Description
[technical field]
The utility model relates to a kind of light guide plate and module backlight that is applied to field of liquid crystal display, relates in particular to a kind of light guide plate and module backlight of side-light type.
[background technology]
(Light Guide Plate LGP) mainly comprises light entrance face, reflecting surface, exit facet and several side to light guide plate, is the important component part in the LCD backlight module system.Its effect be the light that sends of guiding spaced point light source (for example light emitting diode) or line source (for example cold-cathode tube) from a plane outgoing, improve the homogeneity of luminous gray scale of panel and luminosity simultaneously.Light guide plate generally adopts the synthetic resin material to make, and its substrate shape is divided into plate and the wedge type curved face type.
The light that enters light guide plate will be propagated in plate according to full emission principle, when light ran into the microstructure (pattern) on light guide plate surface, full launching condition was destroyed, and light is from the positive ejaculation of light guide plate, density, the microstructure design that varies in size can make the light guide plate uniformly light-emitting.The light guide board microstructure manufacturing technology can be divided into two big classes: printing-type and non-printing-type.The former utilizes the wire mark mode that printing ink is imprinted on the light guide plate, makes microstructure shape and distribution.The latter in mould, comparatively simplifies microstructure design on making then directly with ejection forming technique, and the precision height, is present light guide plate technology main flow.Non-printing-type method for making is divided into again: chemical etching method, laser direct-writing method and precision optical machinery processing method etc.
Along with LCD (Liquid Crystal Display, LCD) such as mobile phone, Vehicular display device, personal digital assistant (Personal Digital Assistant, PDA) and the expansion of application such as televisor, backlight technology based on light guide plate has been proposed requirements at the higher level, mainly shown: high brightness, low cost, low energy consumption, lightening etc.
As shown in Figure 1, traditional module backlight 10 comprises light source 11, light guide plate 13 and blooming pieces such as reflecting plate 12, diffusion sheet 14 and blast sheet 15 at present.Wherein reflector plate 12 is that the light that will not be scattered imports in the light guide plate 13 again, and diffusion sheet 14 makes light form diffusion and evenly diffusion, eliminates the clear zone that microstructure forms on the light guide plate, and blast sheet 15 plays converging ray, improves the effect of brightness.
Yet from the shooting angle of light beam, angle control is not considered in the design of above-mentioned light guide plate, and therefore the light beam from the outgoing of light guide plate exit facet will deviate from light source rather than vertical exit facet.After the effect of such light beam through bloomings such as diffusion sheet and blast sheets, just can reach actual request for utilization with direction directive LCD perpendicular to exit facet.
And for example shown in Figure 2, on October 10th, 2000, the 6th, 130, No. 930 United States Patent (USP)s of bulletin disclosed the light guide plate 20 that a kind of reflecting surface has the V-type microstructure, and the surface design of this V-type microstructure becomes minute surface, thereby can remove reflector plate.
But the light guide plate of this back lighting device does not have the angle control function, thus still to add blooming pieces such as blast sheet, diffusion sheet, so that final emergent light can vertically penetrate.
Therefore, being necessary to provide a kind of need not add blooming piece and can make light guide plate that the vertical exit facet of emergent light penetrates and the module backlight of using this kind light guide plate.
[utility model content]
First technical matters to be solved in the utility model is: a kind of light guide plate is provided, can not need adds blooming piece and the vertical exit facet of emergent light is penetrated.
Second technical matters to be solved in the utility model is: a kind of module backlight is provided, and it has above-mentioned light guide plate, thereby can not need add blooming piece and realize making the function of the vertical outgoing of emergent light.
For solving above-mentioned first technical matters, the technical scheme that the utility model provides is: a kind of light guide plate comprises that a plane of incidence, an exit facet and are provided with the reflecting surface that increases anti-film.Wherein, this reflecting surface is formed with some V-type microstructures towards outside protrusion of this light guide plate and angle unanimity, its drift angle is the 40-95 degree, itself and formed first and second base angles, plane, reflecting surface place are respectively 70-90 degree and 15-50 degree, and the summation at this drift angle and first and second base angles is 180 degree.During use, the light that sends by light source to small part in the plane of incidence enters this light guide plate, through the edge, V-type microstructure reflection back of this reflecting surface perpendicular to the direction outgoing of exit facet.
Described V-type microstructure can be along the direction that deviates from this plane of incidence by dredging to solid matter cloth.
Described V-type microstructure can be arranged along the direction that deviates from this plane of incidence is ascending.Wherein, the size of V-type microstructure can be arranged as follows: y=0.0001x2+0.0005x+0.0023, and wherein, x is the position coordinates of V-type microstructure, y is a V-type microstructure width value, increases with the increase of x.
The width range of described V-type microstructure is no more than 200 microns.Wherein, the optimum width scope is the 10-112 micron.
Described V-type microstructure is a prismatic, and along its relative opposite side extension of a side direction of the plane of incidence, and each V-type microstructure is arranged parallel to each other.Wherein, in each V-type microstructure, the height unanimity on this plane, reflecting surface place of its arbitrary vertex distance.
Second base angle of described V-type microstructure is 30 degree.Wherein, the drift angle of V-type microstructure can be 65 degree.
Described light guide plate can be flat board or wedge type plate.
For solving above-mentioned second technical matters, the technical scheme that the utility model provides is: a kind of module backlight, comprise a sidelight source and a light guide plate, wherein this light guide plate comprises that a plane of incidence, an exit facet and are provided with the reflecting surface that increases anti-film, it is characterized in that, this reflecting surface is formed with some V-type microstructures towards outside protrusion of this light guide plate and angle unanimity, its drift angle is the 40-95 degree, itself and formed first and second base angles, plane, reflecting surface place are respectively 70-90 degree and 15-50 degree, and the summation at this drift angle and first and second base angles is 180 degree.During use, the light that sends by the sidelight source to small part in the plane of incidence enters this light guide plate, through the edge, V-type microstructure reflection back of this reflecting surface perpendicular to the direction outgoing of exit facet.
With respect to prior art, the angle of the utility model control V-type microstructure and the reflecting surface with high reflection characteristic can be easily be controlled at the emergent light of light guide plate on the direction of vertical exit facet, have utilized luminous energy to greatest extent.Such light guide plate reaches and has improved brightness by its module backlight of forming on function, has structurally removed the bloomings such as reflector plate, diffusion sheet and blast sheet of traditional backlight film group, has simplified system, has improved performance.
The homogeneity that while the utility model can be controlled emergent light brightness by the distribution and the density of adjusting V-type microstructure, make vertical and be parallel to homogeneity on the both direction that light beam of light source propagates more than 82%, and the light beam emergence angle half-breadth of this both direction is less than 30 degree, and visible most of light beam penetrates along the exit facet direction perpendicular to light guide plate.
[description of drawings]
Fig. 1 is the structural representation of traditional module backlight;
Fig. 2 is the schematic cross-section of the 6th, 130, No. 730 light guide plate that United States Patent (USP) disclosed of prior art;
The schematic perspective view of the plate light guide plate that Fig. 3 provides for the utility model;
Fig. 4 is the enlarged drawing along Fig. 3 local I V;
The light path synoptic diagram of the plate light guide plate that Fig. 5 provides for the utility model;
Fig. 6 is parallel to the normalization luminance brightness of the light beam of light source direction of propagation (horizontal direction) and the relation curve of angle for plate light guide plate of the present utility model edge;
Fig. 7 is that plate light guide plate of the present utility model edge is perpendicular to the normalization luminance brightness of the light beam of light source direction of propagation (vertical direction) and the relation curve of angle;
Fig. 8 be among Fig. 6 normalization brightness with the relation curve of the change in location of distance light source distance (along direction of beam propagation);
Fig. 9 is the relation curve that normalization brightness changes with position (along perpendicular to direction of beam propagation) among Fig. 7;
The schematic perspective view of the wedge type light guide plate that Figure 10 provides for the utility model.
[embodiment]
The utility model is described in further detail below in conjunction with accompanying drawing.
See also Fig. 3 to Fig. 5, a kind of plate light guide plate 30 provided by the utility model comprises a plane of incidence 31, an exit facet 33, reflecting surface 32 and other three sides (indicate) relative with this exit facet 33.Wherein, the plane of incidence 31 is formed at the side that light guide plate 30 is closed on light source 40.Exit facet 33 is formed at the end face of this light guide plate 30.Reflecting surface 32 is formed at the bottom surface of light guide plate 30, and it is provided with and increases anti-film 36.
Importantly, this reflecting surface 32 also is formed with plurality of V-shaped microstructure 320, and it is along deviating from the outer projection of the direction-guidance tabula rasa 30 of this exit facet 31.The vertex angle theta of V-type microstructure 320
1Between the 40-95 degree, itself and the formed first and second base angle θ in plane, reflecting surface 32 place
2, θ
3Be respectively 70-90 degree and 15-50 degree.Certainly, vertex angle theta
1With the first and second base angle θ
2, θ
3The summation of addition should equal 180 degree.
During use, the part light that light source 40 sends arrives the V-type microstructure 320 of reflecting surface 32 and produces reflection in the plane of incidence 31 enters this light guide plate 30, is penetrated by exit facet 33 along the direction perpendicular to exit facet 33.
In the present embodiment, the vertex angle theta of V-type microstructure 320
1Be 65 degree, the first bigger base angle θ
2Be 85 degree, the second less base angle θ
3Be 30 degree.
In addition, for improving the outgoing uniformity of light, the size of these a plurality of V-type microstructures 320 is ascending arranging along the direction that deviates from this plane of incidence 31.Be that its V-type microstructure 320 near the light source place is less, bigger away from the V-type microstructure 320 at light source place.Be noted that the incremental manner of these V-type microstructure 320 sizes generally is non-linear rule, and will need specific design according to the requirement of light guide plate material behavior and emergent light brightness uniformity.Its incremental manner can be passed through following formulate:
y＝0.0001x
2+0.0005x+0.0023；
Wherein, x is the mean distance between the V-type microstructure 320 and the plane of incidence 31, and y is 320 microstructure width values, increases with the increase of x.
The minimum widith L that is to be noted that each V-type microstructure 320 is preferably in 10 microns, but can be according to the processing technology level, less than 10 microns.Its breadth extreme L can be at 200 microns, so that human eye is not easy to find out V-type microstructure 320 on the light guide plate 30 by LCD, thereby can removal can cause the very diffusion sheet of macro-energy loss.The width L minimum of the V-type microstructure 320 of present embodiment is 10 microns, is 112 microns to the maximum.
Simultaneously, these a plurality of V-type microstructures 320 edges deviate from the direction of the plane of incidence 31 by dredging to solid matter cloth.Be that its arranging density is near more sparse more apart from light source 40, every adjacent two V-type microstructures, 320 spacings are bigger; Far away more intensive more apart from light source 40, every adjacent two V-type microstructures, 320 spacings are less.
In actual use, if light guide plate 30 has the higher phenomenon of local printing opacity brightness, can dwindle the size of V-type microstructure and the arranging density that reduces the V-type microstructure; Otherwise,, can increase the arranging density of the size and the increase V-type microstructure of V-type microstructure if local printing opacity brightness is on the low side.
In addition, for ease of carrying out precision optical machinery processing, the V-type microstructure 320 in the present embodiment is designed to prismatic, extends to its relative opposite side along a side of the plane of incidence 31, continuously non-cracking.In each V-type microstructure 320, the height unanimity on this plane, reflecting surface place of its arbitrary vertex distance.Simultaneously, each V-type microstructure 320 is arranged parallel to each other.
Increase anti-film 36 and can be a metal or medium plated film, as the aluminium film.Reflecting surface 32 comprises that the V-type microstructure 320 of protrusion has high reflectivity by technologies such as plated films.For improving capacity usage ratio, three sides except that the plane of incidence 31 also should have high reflectivity, can increase anti-film 36 by plating and realize.
See also Fig. 6 and Fig. 7, it reflects the angular distribution situation of irradiating light beam.All in 30 degree, most of light beam penetrates along exit facet 33 directions perpendicular to light guide plate 30 the angle half-breadth of both direction as can be seen.
See also Fig. 8 and Fig. 9, its display brightness is with the situation of change of position, and reflects the homogeneity situation of light guide plate 30 outgoing brightness.Wherein Fig. 8 demonstrates normalization brightness among Fig. 6 with the situation of change of distance light source distance, and Fig. 9 is that normalization brightness among Fig. 7 is with the situation of change of position (along perpendicular to direction of beam propagation).Therefrom the brightness of light guide plate 30 remains on homogeneity more than 82% at as above both direction as can be seen.
See also Figure 10, the design of above-mentioned V-type microstructure 320 can be applicable in the wedge type light guide plate equally.In this embodiment, the wedge type light guide plate 90 that the utility model provides comprises a plane of incidence 91, an exit facet 93, a reflecting surface 92 and other three sides.Wherein, the plane of incidence 91 is formed at the side that light guide plate 90 is closed on light source 80.Exit facet 93 is formed at the end face of this light guide plate 90.Reflecting surface 92 is formed at the bottom surface of light guide plate 90, and it is provided with and increases anti-film (not indicating).
Similarly, this reflecting surface 92 also is formed with plurality of V-shaped microstructure 920, to the outer projection of light guide plate 90.The drift angle of V-type microstructure 920 with and with the scope at formed first and second base angles, plane, reflecting surface 92 place all with last embodiment in identical.
During use, the part light that light source 80 sends arrives the V-type microstructure 920 of reflecting surface 92 and produces reflection in the plane of incidence 91 enters this light guide plate 90, is penetrated by exit facet 93 along the direction perpendicular to exit facet 93.
It should be noted that; the main module of being formed by sidelight source and light guide plate 30 or 90 backlight; the bloomings such as reflector plate, diffusion sheet and blast sheet of traditional backlight film group have structurally been removed; and emergent light can be controlled on the direction of vertical exit facet; thereby realize the function of traditional backlight film group, therefore belong to the utility model theme required for protection equally.
The angle of the utility model control V-type microstructure and the reflecting surface with high reflection characteristic can be easily be controlled at the emergent light of light guide plate on the direction of vertical exit facet, have utilized luminous energy to greatest extent.Such light guide plate has improved brightness on function, structurally removed the bloomings such as reflector plate, diffusion sheet and blast sheet of traditional backlight film group, has simplified system, has improved performance.
The homogeneity that while the utility model can be controlled emergent light brightness by the distribution and the density of adjusting V-type microstructure, make vertical and be parallel to homogeneity on the both direction that light beam of light source propagates more than 82%, and the light beam emergence angle half-breadth of this both direction is less than 30 degree, and visible most of light beam penetrates along the exit facet direction perpendicular to light guide plate.
In addition, those skilled in the art also can do other variations in the utility model spirit, and certainly, the variation that these are done according to the utility model spirit all should be included within the utility model scope required for protection.
Claims (12)
1. light guide plate, comprise that a plane of incidence, an exit facet and are provided with the reflecting surface that increases anti-film, it is characterized in that, this reflecting surface is formed with some V-type microstructures towards outside protrusion of this light guide plate and angle unanimity, its drift angle is the 40-95 degree, itself and formed first and second base angles, plane, reflecting surface place are respectively 70-90 degree and 15-50 degree, and the summation at this drift angle and first and second base angles is 180 degree.
2. light guide plate as claimed in claim 1 is characterized in that, described V-type microstructure edge deviates from the direction of this plane of incidence by dredging to solid matter cloth.
3. light guide plate as claimed in claim 1 is characterized in that, described V-type microstructure is along ascending the arranging of direction of deviating from this plane of incidence.
4. light guide plate as claimed in claim 3 is characterized in that the size of described V-type microstructure is arranged as follows: y=0.0001x2+0.0005x+0.0023, wherein, x is the mean distance between the V-type microstructure and the plane of incidence, and y is a V-type microstructure width value, increases with the increase of x.
5. as each described light guide plate of claim 1 to 4, it is characterized in that the width range of described V-type microstructure is no more than 200 microns.
6. light guide plate as claimed in claim 5 is characterized in that, the width range of described V-type microstructure is the 10-112 micron.
7. as each described light guide plate of claim 1 to 4, it is characterized in that described V-type microstructure is a prismatic, along its relative opposite side extension of a side direction of the plane of incidence, and each V-type microstructure is arranged parallel to each other.
8. light guide plate as claimed in claim 7 is characterized in that, in described each V-type microstructure, and the height unanimity on this plane, reflecting surface place of its arbitrary vertex distance.
9. as each described light guide plate of claim 1 to 4, it is characterized in that second base angle of described V-type microstructure is 30 degree.
10. light guide plate as claimed in claim 9 is characterized in that, the drift angle of described V-type microstructure is 65 degree.
11. light guide plate as claimed in claim 1 is characterized in that, described light guide plate is flat board or wedge type plate.
12. module backlight, comprise a sidelight source and a light guide plate, wherein this light guide plate comprises that a plane of incidence, an exit facet and are provided with the reflecting surface that increases anti-film, it is characterized in that, this reflecting surface is formed with some V-type microstructures towards outside protrusion of this light guide plate and angle unanimity, its drift angle is the 40-95 degree, and itself and formed first and second base angles, plane, reflecting surface place are respectively 70-90 degree and 15-50 degree, and the summation at this drift angle and first and second base angles is 180 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420088763 CN2736798Y (en) | 2004-09-20 | 2004-09-20 | Light guide plate and backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420088763 CN2736798Y (en) | 2004-09-20 | 2004-09-20 | Light guide plate and backlight module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2736798Y true CN2736798Y (en) | 2005-10-26 |
Family
ID=35307533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420088763 Expired - Lifetime CN2736798Y (en) | 2004-09-20 | 2004-09-20 | Light guide plate and backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2736798Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100462798C (en) * | 2004-09-02 | 2009-02-18 | 清华大学 | Light guide board and backlight module set |
| CN102095141A (en) * | 2011-02-22 | 2011-06-15 | 青岛海信电器股份有限公司 | Backlight module and display equipment |
| CN102331598A (en) * | 2011-09-19 | 2012-01-25 | 苏州向隆塑胶有限公司 | Light guide plate, manufacturing method thereof and light source device |
| CN103375732A (en) * | 2012-04-13 | 2013-10-30 | 群康科技(深圳)有限公司 | Backlight module, light guide plate of backlight module, and display comprising the backlight module |
| CN110361808A (en) * | 2019-07-19 | 2019-10-22 | 京东方科技集团股份有限公司 | Light guide plate and preparation method thereof, backlight module and display device |
| US11112824B2 (en) | 2019-03-11 | 2021-09-07 | Coretronic Corporation | Backlight module and display device |
-
2004
- 2004-09-20 CN CN 200420088763 patent/CN2736798Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100462798C (en) * | 2004-09-02 | 2009-02-18 | 清华大学 | Light guide board and backlight module set |
| CN102095141A (en) * | 2011-02-22 | 2011-06-15 | 青岛海信电器股份有限公司 | Backlight module and display equipment |
| CN102095141B (en) * | 2011-02-22 | 2014-03-26 | 青岛海信电器股份有限公司 | Backlight module and display equipment |
| CN102331598A (en) * | 2011-09-19 | 2012-01-25 | 苏州向隆塑胶有限公司 | Light guide plate, manufacturing method thereof and light source device |
| CN103375732A (en) * | 2012-04-13 | 2013-10-30 | 群康科技(深圳)有限公司 | Backlight module, light guide plate of backlight module, and display comprising the backlight module |
| US11112824B2 (en) | 2019-03-11 | 2021-09-07 | Coretronic Corporation | Backlight module and display device |
| CN110361808A (en) * | 2019-07-19 | 2019-10-22 | 京东方科技集团股份有限公司 | Light guide plate and preparation method thereof, backlight module and display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20090218 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |