CN1504776A

CN1504776A - Light conducting element

Info

Publication number: CN1504776A
Application number: CNA021521913A
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: 2002-12-05
Filing date: 2002-12-05
Publication date: 2004-06-16

Abstract

A photoconductive device comprising an incident plane, a bottom plane and an outgoing plane, wherein the incident plane is used for receiving the light beams from the external light source, the bottom plane is connected with the incident plane, the outgoing plane is opposite the bottom plane to guide the light beams out of the light conducting element, wherein a plurality of grid points are distributed on the bottom plane of the light conducting element, the outgoing plane has a plurality of regularly configured pyramid-shaped prism arrangement for focusing the outgoing light beams and enhancing the intensity of the outgoing light beams from the light conducting element.

Description

Light-guide device

[technical field]

The present invention relates to a kind of light-guide device that is used for LCD.

[background technology]

LCD is a kind of non-self light-emitting display device, it shows it mainly is passing through or the obstructed realization of coming by control light beam that external light source sends, therefore need external light source and corresponding guiding device, this guiding device can be with the beam direction display panel that external light source sent.

A kind of prior art back light system 100 as shown in Figure 1, this back light system generally includes a light source 110, a light-guide device 120, a diffuser plate 130 and prism plate combination 140, wherein this diffuser plate 130 and prism plate combination 140 is arranged on this light-guide device 120 in regular turn, prism plate combination 140 is made of the upper and lower prism plate 142,141 that is parallel to each other, prism structure on its each prism plate is parallel to each other, the prism distribution approximate vertical of two prism plates 142,141.This light-guide device 120 can be made by polymeric resin material, as acryl resin, polycarbonate etc., shape roughly is wedge shape, it comprise a plane of incidence 121, an exit facet 122, one with exit facet 122 relative and angled bottom surfaces 123, wherein this bottom surface 123 is printed with the site (scheming not show) of a plurality of tool scatterings and reflection function by net-point printing (Dot Printing) mode.The plane of incidence 121 of this light-guide device 120 receives the light beam that is sent from sidepiece light source 110, this light beam forms the light beam evenly dispersed through the scattering of bottom surface 123 and reflection back and is derived by exit facet 122, again by shining display panel (figure does not show) after diffuser plate 130, the prism plate combination 140.But, because this back light system 100 adopts more, the complex structure of element, cause that manufacturing process is more, cost is higher, and owing to have a plurality of interfaces between its each element, light beam is more at the order of reflection at interface, cause the beam energy loss bigger, the intensity of outgoing beam a little less than, thereby this back light system emitting brightness is lower.

A kind of back light system 200 of Fig. 2 and the 6th, 123, No. 431 announcements of United States Patent (USP) that Figure 3 shows that bulletin on September 26th, 2000, it roughly is wedge shape, comprises a light source 210 and a light-guide device 220.This light-guide device 220 comprises a plane of incidence 221, an exit facet 222, and and the plane of incidence 221 an angled bottom surface 223, one and the plane of incidence 221 opposing end faces 230 relative with exit facet 222.This plane of incidence 221 receives the light beam that light source 210 is sent, these exit facet 222 non-being equally spaced along the prism structure 250 that is parallel to the plane of incidence 221 directions of light-guide device 220, the spacing of this prism structure 250 reduces gradually from the plane of incidence 221 opposing end surfaces 230, and the spacing that is positioned at the two adjacent ribs mirror structures 250 at end face 230 places is zero.This prism structure 250 and this light-guide device 220 are formed in one, and roughly are pyramid, protrude with respect to exit facet 222.This light-guide device 220 is incorporated into exit facet 222 with prism structure 250, the simplification of implementation structure.But, the bottom surface 223 of this light-guide device 220 is for the plane and be coated with reflectance coating, as the aluminium film, through the intensity distributions inequality of its beam reflected at exit facet 222, the prism structure 250 of exit facet 222 need be designed to the non-equidistance shape to revise light intensity and direction, make the light intensity of exit facet 222 even.Therefore, the design of these prism structure 250 spacings need be carried out according to exit facet 222 distribution of light intensity, and it realizes more complicated, and exiting surface 222 is not provided with the prism structure zone, because there is not the optically focused of prism, thereby these light-guide device 220 emitting brightness are lower.

[summary of the invention]

In order to overcome the deficiency that prior art light-guide device design is complicated, light output intensity is low, the invention provides a kind of light-guide device, its simplicity of design, light output intensity are higher.

The technical solution adopted for the present invention to solve the technical problems is: a kind of light-guide device is provided, this light-guide device comprises a plane of incidence, a bottom surface and an exit facet, this plane of incidence is used for receiving the light beam that is sent by external light source, this bottom surface links to each other with the plane of incidence, this exit facet is relative with the bottom surface, and light beam is derived this light-guide device.Wherein, the bottom surface of this light-guide device is distributed with a plurality of sites, the pyramid prism structure that a plurality of rules of this outgoing mask are evenly arranged.

Compared with prior art, the present invention has the following advantages: because of light-guide device of the present invention combines prism plate, make it have the function of optically focused.It adopts pyramid prism structure and corresponding site, and the optically focused of scattering, reflection and prism structure by the site can improve the intensity of light-guide device outgoing beam.In addition, this prism structure is to be evenly distributed on the light-guide device exit facet, compares with the non-uniform Distribution of prior art, and it is easier to realize.

[description of drawings]

Fig. 1 is a kind of three-dimensional exploded view of prior art back light system.

Fig. 2 is the stereographic map of another kind of prior art back light system.

Fig. 3 is the vertical view of prior art back light system shown in Figure 2.

Fig. 4 is the stereographic map of light-guide device first embodiment of the present invention.

Fig. 5 is the distribution schematic diagram of light-guide device lattice point structure shown in Figure 4.

Fig. 6 is the distribution schematic diagram of light-guide device prism structure shown in Figure 4.

Fig. 7 is the stereographic map of light-guide device second embodiment of the present invention.

Fig. 8 is the distribution schematic diagram of light-guide device lattice point structure shown in Figure 7.

[embodiment]

Please refer to Fig. 4, is the stereographic map of light-guide device first embodiment of the present invention.The rectangular structure that this light-guide device 300 is formed in one, its material can be tygon, polycarbonate etc., comprise a plane of incidence 321, an exit facet 322 and a bottom surface 323, wherein, the plane of incidence 321 receives the light beam that is sent by its sidepiece light source 310, and with these light beam importing light-guide device 300 inside, beam reflection, scattering that this bottom surface 323 will import, the scattered beam that formation is evenly dispersed along all directions, this exit facet 322 is derived light-guide device 300 with this light beam of evenly dispersing, the display panels that leads (figure does not show).

Please refer to Fig. 5, bottom surface 323 is distributed with a plurality of sites of evenly arranging 324, this site 324 can be formed on the bottom surface 323 by modes such as net-point printing, texture or etchings, and its light beam with the plane of incidence 321 importings reflects, scattering, forms the light beam along the even scattering of all directions.

Please refer to Fig. 6, be evenly distributed with a plurality of prism structures 350 on the exit facet 322, this prism structure 350 roughly is pyramid, its light beam that exit facet 322 is derived converges, the outgoing beam of evenly dispersing along all directions is converged in the preset range, thereby make the outgoing beam intensity in this preset range increase, and then improve the light-guide device emitting brightness.

Please refer to Fig. 7, is the stereographic map of light-guide device second embodiment of the present invention.The sphenoid structure that this light-guide device 400 is formed in one, its material can be tygon, polycarbonate etc., comprises a plane of incidence 421, an exit facet 422 and a bottom surface 423, and this bottom surface 423 and the plane of incidence 421 tilt to intersect.Wherein, the plane of incidence 421 receives the light beam that is sent by the light source of its sidepiece (figure does not show), and with these light beam importing light-guide device 400 inside, beam reflection, scattering that this bottom surface 423 will import, the scattered beam that formation is evenly dispersed along all directions, this exit facet 422 is derived light-guide device 400 with this light beam of evenly dispersing, the display panels that leads (figure does not show).

Please refer to Fig. 8, be distributed with a plurality of sites 424 on the bottom surface 423, this site 424 can be formed on bottom surface 423 by modes such as net-point printing, texture or etchings, it is arranged to close mode along being by dredging away from light source (figure does not show) direction, the light beam that the plane of incidence 421 is imported reflects, scattering, forms the light beam along the even scattering of all directions.

For obtaining better light guide effect, can adopt the plated film mode further to strengthen the utilization factor of light beam, but the plane of incidence 321,421 and exit facet 322,422 coating anti reflection films usually, reflectance coating can be plated in bottom surface 323,423.

Claims

1. light-guide device, comprise a plane of incidence, a bottom surface that links to each other with the plane of incidence and one and the bottom surface is relative and light beam is derived the exit facet of this light-guide device that is used for receiving beam, it is characterized in that: the bottom surface of this light-guide device is distributed with a plurality of sites, the pyramid prism structure that a plurality of rules of outgoing mask of this light-guide device are evenly arranged.

2. light-guide device as claimed in claim 1 is characterized in that: this bottom surface is perpendicular to the plane of incidence.

3. light-guide device as claimed in claim 2 is characterized in that: the site of this bottom surface is for evenly distributing.

4. light-guide device as claimed in claim 1 is characterized in that: this bottom surface and the plane of incidence tilt to intersect.

5. light-guide device as claimed in claim 4 is characterized in that: the site of this bottom surface along away from the light source side direction by dredging to close distribution.

6. light-guide device as claimed in claim 5 is characterized in that: this bottom surface has reflectance coating.

7. light-guide device as claimed in claim 6 is characterized in that: this plane of incidence and exit facet have anti-reflective film.