CN2594820Y

CN2594820Y - Light source devices

Info

Publication number: CN2594820Y
Application number: CN 02249984
Authority: CN
Inventors: 余泰成; 吕昌岳; 陈杰良
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2002-11-29
Filing date: 2002-11-29
Publication date: 2003-12-24
Anticipated expiration: 2012-11-29

Abstract

The utility model relates to a light source device applied to a liquid crystal display device. The light source device comprises a plurality of LEDs, a light conducting plate and a plurality of micro lenses, wherein, the light conducting plate comprises a light incidence surface opposite to the plurality of LEDs, and a reflecting plate reflecting light emitted from the bottom of the light conducting plate back to the light conducting plate, or is coated with a reflecting film; the plurality of micro lenses are arranged between the plurality of LEDs and the incidence surface of the light conducting plate; the plurality of LEDs and the Light conducting plate are respectively positioned within working distance of both sides of the plurality of micro lenses. Consequently, divergent light emitted from the plurality of LEDs is coupled by the micro lenses and enters the light conducting plate from the incidence surface in parallel light mode; the parallel light is coupled by the light conducting plate and is uniformly emitted from a plane.

Description

Light supply apparatus

[technical field]

The utility model relates to a kind of light supply apparatus of uniformly light-emitting, particularly a kind of light supply apparatus that is applied in the LCD as area source.

[background technology]

Present stage, LCD is fast because of its reaction time, display quality is preferable, radiationless, be applicable to advantages such as large-scale animation display, be widely used in notebook, desk-top computer monitor, workstation, industry monitoring device, Global Positioning System (GPS) (GPS), personal data processing, game machine, videophone, portable V CD, DVD and some other mancarried devices.So, liquid crystal itself is not luminous, must have a light supply apparatus to provide display image required light for it.And display panels is made up of a plurality of liquid crystal cells, and each liquid crystal cells is to the same requirement of having obtained of light, so this light supply apparatus must be the equally distributed area source of glorious degrees.Light source in the normal light source apparatus has two kinds of line source and pointolites, the difference that light source character and position thereof are provided with, and the structural design thought of this light supply apparatus is also with regard to corresponding difference.

Please see Figure 1, a kind of commonly used be that the light supply apparatus 10 of light source includes the prism plate and diffuser plate (scheming not show) that a plurality of light emitting diodes 13, a light guide plate 15, fit in the reflecting plate (figure does not show) of light guide plate 15 bottom surfaces and are arranged at light guide plate 15 exiting surfaces with the pointolite.These a plurality of light emitting diodes 13 evenly are spaced incidence surface one side in light guide plate 15 each other.Light guide plate 15 is converted into the area source outgoing with the pointolite of light emitting diode 13.

Please see Fig. 2 in the lump, it is Young principle of interference synoptic diagram, three light emitting diode 13 emergent light frequencies oscillating component, phasic differences basic identical, that existence is parallel to each other are also more stable, as adopt the bigger light emitting diode of the angle of divergence, be easy to generate interference, and zones such as the A in Fig. 1, B, C produce dim spot as shown in Figure 2, thereby make whole light guide plate 15 luminance nonuniformities, if adopt light emitting diode than small divergence angle, then in passing through, make luminance shortage in this zone near exterior domain D, the E of the LED source angle of divergence, the no light beam in F, G zone.

[utility model content]

Be the defective of area source luminance nonuniformity and luminance shortage in the solution background technology, the utility model provides a kind of briliancy equally distributed light supply apparatus.

The technical scheme of the utility model technical solution problem is: a kind of light supply apparatus is provided, it comprises a plurality of light emitting diodes, a light guide plate and a plurality of lenticule, and this light guide plate comprises that a light entrance face relative with these a plurality of light emitting diodes and a reflection return the reflecting plate of light guide plate or be coated with a reflectance coating from light guide plate bottom surface emergent light; These a plurality of lenticules are arranged between these a plurality of light emitting diodes and this light guide plate plane of incidence, and these a plurality of light emitting diodes and this light guide plate are positioned respectively in the operating distance of these a plurality of lenticules both sides, thereby make the be coupled diverging light of these a plurality of light emitting diode outgoing of this lenticule be incident to light guide plate with uniform directional light from the plane of incidence, this light guide plate is coupled this directional light from a uniform plane outgoing.

Light supply apparatus of the present utility model adopts lenticule and light emitting diode combined to constitute combination of light sources, make light emitting diode pointolite diverging light be converted into directional light and be incident to light guide plate, be different from the background technology light emitting diode diverging light outgoing at a certain angle to light guide plate, in light guide plate, interfere effect easily, so that produce the different zone of light and shade brightness or producing the dark space near light source and the exterior domain that exceeds the angle of divergence at the light guide plate exit facet, directional light after the utility model collimates with lenticule goes into to inject light guide plate, can not produce interference, can not occur dark space yet near light source.And adopt the liquid crystal indicator of this light supply apparatus also can obtain uniform briliancy.

[description of drawings]

Below in conjunction with the drawings and specific embodiments the utility model is further specified.

Fig. 1 is the stereographic map of background technology light supply apparatus.

Fig. 2 is a Young principle of interference synoptic diagram.

Fig. 3 is the cross-sectional view of the utility model first embodiment light supply apparatus.

Fig. 4 is the light path coupling synoptic diagram of lenticule and light emitting diode among Fig. 3.

Fig. 5, the 6th, lenticular other two kinds of embodiments among Fig. 3.

Fig. 7 is the cross-sectional view of another embodiment light supply apparatus of the utility model.

[embodiment]

Please see Figure 3, first embodiment of the utility model light supply apparatus, this light supply apparatus 20 includes a plurality of light emitting diodes 21 and a light guide plate 22, a plurality of lenticules 23 are arranged between this light emitting diode 21 and the light guide plate 22, and these a plurality of light emitting diodes 21 and the operating distance that this light guide plate 22 is positioned these a plurality of lenticule 23 left and right sides respectively interior (detailed aftermentioned) make the diverging light of these lenticule 23 these a plurality of light emitting diode 21 outgoing of coupling be incident in the light guide plate 22 with uniform directional light.

Light guide plate 22 roughly becomes the dull and stereotyped entity of a rectangular parallelepiped; its include one with the adjoining light entrance face 221 of lenticule 23; the light-emitting face 222 vertical with the plane of incidence 221; bottom surface 223; first side (figure does not show); with first side second side surface opposite (figure do not show) and three side 226 relative with the plane of incidence 221; for making light from exit facet 222 even outgoing; usually be provided with a plurality of sites (figure does not show) in this bottom surface 223; can there be the distribution of multiple kenel this site; and for improving the light utilization ratio; in this bottom surface 223 and this each side also be coated with reflectance coating or one deck reflecting plate of fitting again (figure does not show) usually; with reflection from light guide plate 22 bottom surfaces 223 or the side emergent light return light guide plate 22 and from exit facet 222 outgoing, be coated with anti-reflective film to reduce the absorption loss of luminous energy in this plane of incidence 221 and exit facet 222.Light guide plate 22 and the angled setting of combination of light sources that this a plurality of light emitting diodes 21 and lenticule 23 constitute, make the combination of light sources outgoing to the directional light of light guide plate 22 with the direction of being scheduled to and position from 222 outgoing of light guide plate 22 exit facets.Certainly, but combination of light sources also adjacent floor 223 be provided with, be light entrance face with bottom surface 223, at this moment, then should be 223 be coated with anti-reflective film, and in four sides plating reflectance coatings that intersect with light-emitting face 222 and bottom surface 223 or paste reflecting plate with light-emitting face 222 in the bottom surface.

This lenticule 23 can be various lenticules or its combination of industry satisfied collimation condition commonly used, please see Fig. 4 in the lump, each xsect of these a plurality of lenticules 23 is a hypercone xsect (Superconic Cross Section) in the present embodiment, it comprises a part of elliptical area 231, from the outward extending trapezoidal faces 232 of part elliptical area 231 openings.Please cooperate again and see Fig. 5 and Fig. 6, the top margin of this trapezoidal faces also can cave in into curved surface to elliptical area one side, and this trapezoidal dual side-edge also can be arranged in parallel.A plurality of light emitting diodes 21 are positioned the top margin 233 of contiguous corresponding lenticule 23 respectively, and are positioned at the optics operating distance of lenticule 23 top margins 233 1 sides; The plane of incidence 221 of this light guide plate 22 is positioned contiguous this elliptical area 231, and makes light guide plate 22 be positioned at the optics operating distance of these a plurality of lenticule 23 elliptical areas 231 1 sides.The diverging light of a plurality of light emitting diode 21 outgoing is the plane of incidence 221 incidents of even directional light from light guide plate 22 through corresponding lenticule 23 collimations, and light guide plate 22 these parallel beams of transmission are from contiguous or away from exit facet 222 outgoing of combination of light sources.Can be provided with the combination of light sources of a plurality of lenticules 23 and light emitting diode 21 in the utility model, be positioned other side of light guide plate respectively, only need to change the reflectance coating on the light entrance face of light guide plate 22 contiguous combination of light sources into anti-reflective film and get final product.

Please see Figure 7, be the cross-sectional view of the utility model light supply apparatus second embodiment, this light supply apparatus 30 is except its light guide plate 32, and the corresponding construction of the light supply apparatus 20 of other structure and first embodiment is in full accord.This light guide plate 32 roughly becomes a wedge shape; its include one with the adjoining light entrance face 321 of lenticule 33; the light-emitting face 322 that intersects with the plane of incidence 321; acutangulate crossing bottom surface 323 with the plane of incidence 321; first side (figure does not show); with first side second side surface opposite (figure do not show) and three side 326 relative with the plane of incidence 321; for making light from exit facet 322 even outgoing; usually be provided with a plurality of sites (figure does not show) in this bottom surface 323; can there be the distribution of multiple kenel this site; and for improving the light utilization ratio; in this bottom surface 323 and this each side also be coated with reflectance coating or one deck reflecting plate of fitting again (figure does not show) usually; with reflection from light guide plate 32 bottom surfaces 323 or the side emergent light return light guide plate 32 and from exit facet 322 outgoing, be coated with anti-reflective film to reduce the absorption loss of luminous energy in this plane of incidence 321 and exit facet 322.

The light emitting diode diverging light outgoing at a certain angle that is different from background technology is to light guide plate, in light guide plate, interfere effect easily, produce the different zone of light and shade brightness or producing the dark space at the light guide plate exit facet near light source and the exterior domain that exceeds the angle of divergence, light supply apparatus of the present utility model adopts the combination of light sources of lenticule and light emitting diode combined formation as light source, make light emitting diode pointolite diverging light be converted into directional light and be incident to light guide plate, can not produce interference, can not occur dark space yet near light source.Adopt the liquid crystal indicator of this light supply apparatus also can obtain a uniform briliancy.

Claims

1. light supply apparatus, it comprises a plurality of light emitting diodes, one comprises the light guide plate of a light entrance face relative with these a plurality of light emitting diodes, it is characterized in that: this light guide plate also comprise one the reflection return the reflecting plate of light guide plate or be coated with a reflectance coating from light guide plate bottom surface emergent light, a plurality of lenticules are arranged between these a plurality of light emitting diodes and this light guide plate plane of incidence, and these a plurality of light emitting diodes and this light guide plate are positioned respectively in the operating distance of these a plurality of lenticules both sides, thereby make the be coupled diverging light of these a plurality of light emitting diode outgoing of this lenticule be incident to light guide plate with uniform directional light from the plane of incidence, this light guide plate is coupled this directional light from a uniform plane outgoing.

2. light supply apparatus as claimed in claim 1 is characterized in that this lenticular each xsect is a hypercone xsect Superconic Cross Section, and it comprises that a part of elliptical area and is from the outward extending trapezoidal faces of this part elliptical area opening.

3. light supply apparatus as claimed in claim 2 is characterized in that this light guide plate is positioned elliptical area one side of this hypercone xsect.

4. light supply apparatus as claimed in claim 3 is characterized in that these a plurality of lenticules are curved surface towards a plurality of light emitting diode one sides.

5. light supply apparatus as claimed in claim 1 is characterized in that this light supply apparatus comprises that further three or three above light emitting diodes and lenticule integrated positioning are in other side of light guide plate.

6. light supply apparatus as claimed in claim 1, it is characterized in that this light guide plate is a rectangular parallelepiped, it further comprises the light-emitting face vertical with the plane of incidence, bottom surface, first side, second side and three side relative with the plane of incidence, and this bottom surface is provided with a plurality of sites.

7. light supply apparatus as claimed in claim 1, it is characterized in that this light guide plate is a sphenoid, its further include one with crossing light-emitting face, bottom surface, first side, second side and three side relative of the plane of incidence with the plane of incidence, this bottom surface is provided with a plurality of sites.

8. light supply apparatus as claimed in claim 7, it is crossing to it is characterized in that this plane of incidence and bottom surface acutangulate.

9. as the described light supply apparatus of each claim of claim 1 to 8, it is characterized in that this plane of incidence and exit facet are coated with anti-reflective film.