CN2586984Y - Back light device - Google Patents
Back light device Download PDFInfo
- Publication number
- CN2586984Y CN2586984Y CN02250160U CN02250160U CN2586984Y CN 2586984 Y CN2586984 Y CN 2586984Y CN 02250160 U CN02250160 U CN 02250160U CN 02250160 U CN02250160 U CN 02250160U CN 2586984 Y CN2586984 Y CN 2586984Y
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- CN
- China
- Prior art keywords
- guide plate
- lighting device
- light guide
- back lighting
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Light Guides In General And Applications Therefor (AREA)
- Planar Illumination Modules (AREA)
Abstract
The utility model relates to a back light device, which comprises a light guide plate, two lamp tubes and two reflex covers surrounding the lamp tubes, wherein, the light guide plate is used for guiding the transmission direction of light coming from the lamp tubes to enhance the brightness and the homogeneity of outgoing light; the light guide plate comprises an incident surface for receiving light beams, an outgoing surface for guiding the light beams to be shot out and a bottom surface which is opposite to the outgoing surface; the incident surface is intersected with the outgoing surface; the bottom surface is provided with a plurality of bulges; the scattering surfaces of bulges are formed into a curved surface with a specified shape; the curved surface can converge the light beams scattered by the bulges to enhance the luminance brightness of the outgoing light of the light guide plate and the back light device.
Description
[technical field]
The utility model relates to a kind of back lighting device, especially about the higher back lighting device of a kind of emitting brightness.
[background technology]
Because advantages such as the liquid crystal indicator tool is light, thin, power consumption is little are widely used in modernized information equipments such as notebook, mobile phone, personal digital assistant.Because liquid crystal itself is not had a characteristics of luminescence, being required to be it provides back lighting device to realize Presentation Function.
Existing back lighting device comprises light source and light guide plate, the incidence surface setting of the relative light guide plate of light source, and the transmission direction of the light beam that this light-guide plate guides is sent from light source converts line source or pointolite to outgoing backlight.A plurality of sites that distribute, the bottom surface of this light guide plate in order to the total reflection condition of broken beam in the light guide plate internal transmission, and make its scattering improving the homogeneity of light guide plate outgoing beam, and then promote the overall performance of back lighting device.The density of this site, size all can have different designs to adapt to different back lighting devices.
A kind of existing back lighting device can be consulted the United States Patent (USP) the 6th of bulletin on September 3rd, 2002,443, No. 583 (Fig. 1 with reference to), this back lighting device 100 comprise that a fluorescent tube 110, is retained on the light guide plate 200 in the lampshade 120 around the lampshade 120 of fluorescent tube 110 and an end.This light guide plate 200 comprises incidence surface 201, bottom surface 202 and exiting surface 203, and wherein, these fluorescent tube 110 relative these incidence surfaces 201 are provided with.During work, in these light guide plate 200 internal transmission, and be converted to backlight through exiting surface 203 outgoing from the light beam of fluorescent tube 110 and lampshade 120.For increasing the utilization factor of light beam, this back lighting device 100 comprises that further one is arranged at the reflecting plate 210 of bottom surface 202 1 sides of light guide plate 200, the segment beam of reflecting plate 210 reflection 202 outgoing from the bottom surface.And this back lighting device 100 is arranged a diffuser plate 220, first prism plate 230 and second prism plate 240 in regular turn in light guide plate 200 exiting surfaces 203 1 sides, this diffuser plate 220 is in order to strengthen the uniformity coefficient of light guide plate 200 outgoing beams, digonous runner plate 230 and 240 play the optically focused effect, to strengthen the brightness of light guide plate 200.
But, adopt the back lighting device 100 of this existing light guide plate 200 to need to adopt digonous runner plate 230 and 240 to improve brightness with the light beam of assembling from 203 outgoing of light guide plate 200 exiting surfaces, adopt reflecting plate 210 to improve the light beam utilization factor, make its complex structure, material cost height and assembling inconvenience.In addition, have more optical interface in this back lighting device 100, light beam therebetween need experience repeatedly optical effect, causes bigger luminous energy loss, thereby influences the brightness of back lighting device 100.
[utility model content]
For overcome existing back lighting device complex structure, material cost is high and the problem of assembling inconvenience, the utility model provides a kind of simple in structure, cost is lower and emitting brightness is higher back lighting device.
The technical scheme of the utility model technical solution problem is: the utility model back lighting device comprises an at least one light source and a light guide plate.This light guide plate comprises at least one plane of incidence that is used for receiving beam, one and the exit facet that intersects of the plane of incidence and one and the exit facet opposed bottom surface.This bottom surface a plurality of projectioies that distribute, and the scattering surface of these a plurality of projectioies constitutes a curved surface that is used for convergent beam.The relative plane of incidence setting of this light source.
Wherein, the curved surface of this protruding scattering surface formation can be the part face of cylinder or arc surface.This projection can be cylindric, spherical, round table-like, rectangular-shaped or cube.These a plurality of projectioies can be uniformly distributed in the bottom surface, and its size and density also can increase gradually along the direction away from the plane of incidence.
This light guide plate can be plate shaped or the wedge shape light guide plate.This light source can be line source or pointolite.
The utility model back lighting device can further comprise the reflecting plate that is positioned at bottom surface of light guide plate one side and be positioned at the diffuser plate and the prism plate of exit facet one side.
Compare prior art, the beneficial effects of the utility model are: the bottom surface of the light guide plate that the utility model back lighting device adopts a plurality of projectioies that distribute, and the scattering surface of projection forms the curved surface of a given shape, can assemble the light beam after protruding scattering, thereby can improve the light beam utilization factor, make that the light guide plate emitting brightness is higher, the homogeneity that tool is certain.The utility model back lighting device can not use prism plate or only use a prism plate, and it is simple in structure, cost is lower, the energy loss of light beam is less.
[description of drawings]
Fig. 1 is the cut-open view of prior art back lighting device.
Fig. 2 is the stereographic map of the utility model back lighting device first embodiment.
Fig. 3 is the cut-open view of back lighting device shown in Figure 2 along the III-III direction.
Fig. 4 is the stereographic map of the utility model back lighting device second embodiment.
Fig. 5 is the cut-open view of back lighting device shown in Figure 4 along the V-V direction.
Fig. 6 is the stereographic map of the utility model back lighting device the 3rd embodiment.
Fig. 7 is the cut-open view of back lighting device shown in Figure 6 along the VII-VII direction.
Fig. 8 is the cut-open view of the utility model back lighting device the 4th embodiment.
Fig. 9 is the partial sectional view of the light guide plate of another embodiment employing of the utility model back lighting device.
[embodiment]
Seeing also Fig. 2, is the utility model back lighting device first embodiment, and this back lighting device 10 comprises a light guide plate 20 and two light sources 30.This light guide plate 20 comprises two planes of incidence 21, an exit facet 22 that links to each other with the plane of incidence 21 and one and exit facet 22 opposed bottom surface 24.This light source 30 comprises that a fluorescent tube 31 and a part center on the reflex housing 32 of fluorescent tube 31.This two light source 30 is two planes of incidence, 21 settings of this light guide plate 20 relatively respectively.
Please cooperate and consult Fig. 2 and Fig. 3, the bottom surface 24 of this light guide plate 20 distributes a plurality of protruding 23.This a plurality of protruding 23 is used for making beam divergence, destroys the light beam that enters from the plane of incidence 21 in the total reflection condition of light guide plate 20 internal transmission, and improves brightness and homogeneity from the light beam of exit facet 22 outgoing.This a plurality of protruding 23 bottom surface 24 that is evenly distributed on this light guide plate 20, it is a cube, also can be cylindric, round table-like, spherical or rectangular-shaped.These a plurality of scattering surfaces of protruding 23 25 form a curved surface, and it is the part face of cylinder, is used for assembling the light beam through protruding 23 scatterings, and then strengthens the brightness of exit facet 22 outgoing beams.The bottom surface 24 of this light guide plate 20 and the scattering surface 25 of projection 23 have reflectance coating (not indicating), and this reflectance coating is by SiO
2And TiO
2Replace the multilayer film of formation, make projection beam reflection thereon, overflow from the bottom surface 24 of light guide plate 20 and the scattering surface 25 of projection 23 to prevent light beam, thus the energy loss of reduction light beam, the whole optical property of raising light guide plate 20.This reflectance coating can adopt methods such as chemical vapour deposition technique, electron beam evaporation plating method, sputtering method to form, and its reflectivity at visible region is at least 98%.
Compare prior art, because the bottom surface 24 of the light guide plate 20 that the utility model back lighting device 10 adopts distributes a plurality of protruding 23, and the scattering surface 25 of projection 23 forms the curved surface of a given shape, can assemble light beam through protruding 23 scatterings, and the scattering surface 25 of bottom surface 24 and projection 23 has reflectance coating, can improve the light beam utilization factor, thereby make that light guide plate 20 emitting brightness are higher, the homogeneity that tool is certain.And then making the utility model back lighting device 10 need not additionally use outer members such as reflecting plate, it is simple in structure, cost is lower, and the energy loss of light beam is less.
Seeing also Fig. 4 and Fig. 5, is the utility model back lighting device second embodiment, and this back lighting device 11 comprises a light source 30 and a light guide plate 40.This light guide plate 40 comprises a plane of incidence 41 and one and the plane of incidence 41 bottom surface 44 of intersecting, and this light source 30 can be line source (as cathode fluorescent tube) or pointolite (as light emitting diode), and its relative plane of incidence 41 is provided with.This bottom surface 44 distributes a plurality of protruding 43, and the scattering surface 45 of this projection 43 forms a curved surface, and it is the part face of cylinder, is used for assembling the light beam through protruding 43 scatterings.The size of this projection 43 and density increase gradually along the direction away from the plane of incidence 41, are used for improving the homogeneity of light guide plate 40 and back lighting device 11 outgoing beams.The scattering surface 45 of this bottom surface 44 and projection 43 has reflectance coating (not indicating), and this reflectance coating is by SiO
2And TiO
2Replace the multilayer film that form.
Seeing also Fig. 6 and Fig. 7, is the utility model back lighting device the 3rd embodiment.This back lighting device 12 comprises a light source 30 and a light guide plate 60.This light guide plate 60 is wedge shape light guide plate, and it comprises a plane of incidence 61 and a bottom surface 64 that links to each other with the plane of incidence 61 inclinations, and these light source 30 relative these planes of incidence 61 are provided with.This bottom surface 64 distributes a plurality of protruding 63.This a plurality of protruding 63 bottom surface 64 that is uniformly distributed in this light guide plate 60, it is rectangular-shaped, also can be cylindric, round table-like, spherical or cube.These a plurality of scattering surfaces of protruding 63 65 form a curved surface, and it is the part face of cylinder, in order to the light beam of convergence through protruding 63 scatterings, and then the brightness of enhancing light guide plate 60 outgoing beams.The bottom surface 64 of this light guide plate 60 and the scattering surface 65 of projection 63 have reflectance coating (not indicating), overflow from the bottom surface 64 of light guide plate 60 and the scattering surface 65 of projection 63 to prevent light beam, thereby reduce the energy loss of light beam, improve the whole optical property of light guide plate 60 and back lighting device 12.
Seeing also Fig. 8, is the utility model back lighting device the 4th embodiment.This back lighting device 13 comprises a light source 30 and a light guide plate 70.The structure of the structure of this light guide plate 70 and light guide plate shown in Figure 6 60 is roughly the same, and difference is, a reflectance coating is not had in its bottom surface 74, a reflecting plate 78 is set 74 overflows from the bottom surface to prevent light beam.For further strengthening the homogeneity of back lighting device 13 outgoing beam brightness, exit facet 72 1 sides in light guide plate 70 are provided with a diffuser plate 80, for further assembling light beam through diffuser plate 80 scatterings, improve the emitting brightness of back lighting device 13, can one prism plate 90 be set in the opposite side of diffuser plate 80 and exit facet 72 adjacent sides.
Seeing also Fig. 9, is the light guide plate that another embodiment of the utility model back lighting device adopts.The structure of this light guide plate 50 and light guide plate shown in Figure 2 20 is roughly the same, and it comprises a bottom surface 54, and this bottom surface 54 distributes a plurality of protruding 53.This a plurality of protruding 53 bottom surface 54 that is uniformly distributed in this light guide plate 50, it is rectangular-shaped, also can be cylindric, round table-like, spherical or cube.These a plurality of scattering surfaces of protruding 53 55 form a curved surface, and it is an arc surface, is used for assembling the light beam through protruding 53 scatterings, and then strengthens the brightness of light guide plate 50 outgoing beams.The bottom surface 54 of this light guide plate 50 and the scattering surface 55 of projection 53 have reflectance coating (not indicating), overflow from the bottom surface 54 of light guide plate 50 and the scattering surface 55 of projection 53 to prevent light beam, thereby reduce the energy loss of light beam, improve the whole optical property of light guide plate 50 and back lighting device.
Claims (9)
1. back lighting device, it comprises an at least one light source and a light guide plate, this light guide plate comprises at least one plane of incidence that is used for receiving beam, one and the exit facet that intersects of the plane of incidence and one and the exit facet opposed bottom surface, this bottom surface a plurality of projectioies that distribute wherein, the relative plane of incidence setting of this light source is characterized in that: the scattering surface of these a plurality of projectioies constitutes a curved surface in order to convergent beam.
2. back lighting device as claimed in claim 1 is characterized in that the curved surface that this protruding scattering surface constitutes is the part face of cylinder.
3. back lighting device as claimed in claim 1 is characterized in that the curved surface that this protruding scattering surface constitutes is an arc surface.
4. back lighting device as claimed in claim 1 is characterized in that this projection can be cylindric, spherical, round table-like, rectangular-shaped or cube.
5. back lighting device as claimed in claim 1 is characterized in that these a plurality of projectioies are uniformly distributed in the bottom surface.
6. back lighting device as claimed in claim 1 is characterized in that the size of these a plurality of projectioies and density increase gradually along the direction away from the plane of incidence.
7. back lighting device as claimed in claim 1 is characterized in that this light guide plate is plate shaped or the wedge shape light guide plate.
8. back lighting device as claimed in claim 1 is characterized in that this light source can be line source or pointolite.
9. back lighting device as claimed in claim 1 is characterized in that further comprising the reflecting plate that is positioned at bottom surface of light guide plate one side and the diffuser plate and the prism plate that are positioned at exit facet one side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02250160U CN2586984Y (en) | 2002-12-05 | 2002-12-05 | Back light device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02250160U CN2586984Y (en) | 2002-12-05 | 2002-12-05 | Back light device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2586984Y true CN2586984Y (en) | 2003-11-19 |
Family
ID=33720444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02250160U Expired - Lifetime CN2586984Y (en) | 2002-12-05 | 2002-12-05 | Back light device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2586984Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100445827C (en) * | 2004-11-18 | 2008-12-24 | 清华大学 | Light-conducting board and backlight mould set |
| CN101261398B (en) * | 2007-03-08 | 2011-05-18 | 苏州璨宇光学有限公司 | Backlight module |
-
2002
- 2002-12-05 CN CN02250160U patent/CN2586984Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100445827C (en) * | 2004-11-18 | 2008-12-24 | 清华大学 | Light-conducting board and backlight mould set |
| CN101261398B (en) * | 2007-03-08 | 2011-05-18 | 苏州璨宇光学有限公司 | Backlight module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20121205 Granted publication date: 20031119 |