CN101270860A

CN101270860A - Light guide plate, its manufacturing method and upper main core for forming light guide plate

Info

Publication number: CN101270860A
Application number: CNA2008100850814A
Authority: CN
Inventors: 金大岘; 孔成铉
Original assignee: Wooyoung Co Ltd
Current assignee: Wooyoung Co Ltd
Priority date: 2004-10-19
Filing date: 2005-10-19
Publication date: 2008-09-24
Also published as: CN1808235A; KR20060034792A; KR100690504B1

Abstract

The invention provides a light guide plate for a backlight unit; specifically provides an upper main core for forming an emission surface of a light guide plate for a backlight; and to provide a method for manufacturing a light guide plate by using it. This light guide plate for a backlight unit is provided with the emission surface for emitting light, a bottom surface located on the side opposite to the emission surface, and a light-entering surface located between one end in the longitudinal direction of the emission surface and one end in the longitudinal direction of the bottom surface for receiving light radiated from a light source of the backlight unit; and is characterized by that a diffusion pattern comprising a first diagonal line pattern and a second diagonal line pattern formed at predetermined angles in directions opposite to each other with respect to the longitudinal direction is formed on the emission surface.

Description

LGP and manufacture method thereof and the top main core that is used for molded light guide plate

The application divides an application for the invention of " LGP and manufacture method thereof and the top main core that is used for molded light guide plate ", and the applying date of original application is on October 19th, 2005, and application number is 200510112875.1.

Technical field

The present invention relates to a kind of LGP that is used for a back light unit, and more particularly, the present invention relates to a kind of top main core of a light exit surface that is used for molded light guide plate, and a kind ofly being used to use top main core to make the method for described LGP, it can provide uniform Luminance Distribution in the whole zone of corresponding display floater.

Background technology

Present patent application is advocated the right of 10-2004-0083539 korean patent application of submitting on September 19th, 2004 in Korea S Department of Intellectual Property and the 10-2005-0013164 korean patent application of submitting on February 17th, 2005, and whole disclosure wherein are incorporated herein by reference.

Usually, flat-panel monitor (FDL) is divided into light emitting-type (or light emission type) and non-light emitting-type (or receiving the light type).The example of light emitting-type FDL comprises a cathode ray tube (CRT), an electroluminescent display (ELD) and a plasma display floater (PDP).The example of non-light emitting-type FDL comprises LCD (LCD).

LCD is not luminous voluntarily, so it is by from an arbitrary source (for example: received light reproduced image back light unit) using.

Usually, according to the installation site of light source, back light unit is divided into full run-down type and last mo(u)ld bottom half.Last mo(u)ld bottom half back light unit is suitable for the thin and light display of needs.Because arrange that at the two ends of last mo(u)ld bottom half back light unit light source comes emitting linear light, need one to be used for guiding equably the straight line light of being launched to the LGP of its liquid crystal panel than lower part so go up the mo(u)ld bottom half back light unit.

Fig. 1 is the decomposition diagram of downward back light unit conventionally.

With reference to Fig. 1, last mo(u)ld bottom half back light unit 1 comprises a LGP 2.Arrange a light source 6 in the thicker side of LGP 2.Light source 6 and constitute a light source cell 8 around the light reflecting board 7 of a side of light source 6.At arranged beneath one reflector plate 9 of LGP 2, and above LGP 2, have and sequentially pile up prismatic lens 10, diffusion sheet 11 and screening glass 12.Although in Fig. 1, do not illustrate, on prismatic lens 10, form a prism model, come in this way on Y direction, to extend.

The upper surface of LGP 2 forms a light exit surface 3, and its lower surface forms a basal surface 4, and the side surface of the LGP 2 adjacent with light source cell 8 forms optical receiving surface 5.On the lower surface of LGP 2, form a prism model (not shown), make in this way and extend in Y direction, thereby form a prism surface that tilts from light source 8.On optical receiving surface 3 all or part of, form a rough model 5.

Luminous from light source 6, and by optical receiving surface 5 with the light-receiving launched in LGP 2.By the inclination prism surface of the prism model on the LGP 2 with light scattering, and by the light of light exit surface 3 towards the scattering of prismatic lens 10 emission institutes.Will be by prismatic lens 10 by the light scattering once more of light exit surface 3 emission, and launch the light of scattering once more towards diffusion sheet 11 by prismatic lens 10.Yet the light total amount of being launched by prismatic lens 10 may become inhomogeneous on the entire upper surface of prismatic lens 10.

Fig. 2 is the figure that the Luminance Distribution of the light that passes prismatic lens 10 but also do not arrive diffusion sheet 11 is described, as shown in Figure 2, bright line and concealed wire have alternately occurred owing to the inhomogeneous of light.

In order to prevent the appearance of these bright lines and concealed wire, stack diffusion sheet 11 on prismatic lens 10.That is, diffusion sheet 11 is used for the light that scattering is launched by prismatic lens 10, and the brightness on the whole zone of corresponding display floater is become evenly.

As what above mentioned, conventional back light unit 1 must have the diffusion sheet 11 that is superimposed upon on the prismatic lens 10 inevitably, could form uniform brightness.Simultaneously, the rough model 15 that forms on optical receiving surface 5 is used for producing an extra scattering effect, reduces undesirable bright line by this.Yet, because the light concentrated on the upper and lower

marginal portion

17 and 19 of optical receiving surface 5 is more than on the other parts, so the structure of this use rough model 15 causes a light leak problem.

Summary of the invention

The invention provides a kind of modified LGP that is used for back light unit, it does not have rough model on optical receiving surface, thereby prevented the light leak problem, and it does not produce undesirable bright line and concealed wire, thereby in its whole zone, kept uniform brightness.

The present invention also provides a kind of top main core, and it is used for the molded light exit surface that is used for the LGP of back light unit, and a kind of method of using described top main core to make LGP.

According to an aspect of the present invention, a kind of LGP that is used for back light unit is provided, described LGP comprises: a radiative light exit surface, a basal surface, with respect to light exit surface configuration are configured in to be used between vertical end of vertical end of light exit surface and basal surface receiving from the optical receiving surface and of the light of the light emitted of back light unit and are formed on scattering pattern on the light exit surface.Described scattering pattern comprises: one first inclination pattern, and it forms on light exit surface and becomes a predetermined angular with optical receiving surface; One second inclination pattern, it is formed on the light exit surface with an opposite angles with respect to the first inclination pattern.

Scattering pattern may comprise further that one forms and be parallel to the horizontal pattern of optical receiving surface on light exit surface.

The first and second inclination patterns tilt in the opposite direction with respect to the straight line of a horizontal pattern of vertical what, and the angle that tilts in the opposite direction is 5 ° to 60 °.

Can form scattering pattern in the edge that light exit surface and optical receiving surface meet the boundary.

Can begin to push away from edge and pull out scattering pattern.

Can be at isolated edge 20mm to the distance of 50mm with interior formation scattering pattern.

Can on optical receiving surface, further form a sandblast pattern.

According to a further aspect in the invention, a kind of top main core is provided, it is used for the light exit surface of LGP of molded back light unit, described top main core comprises a scattering pattern that forms on its molded surface, described scattering pattern comprises: one first inclination pattern, and it forms on molded surface and becomes a predetermined angular with its edge corresponding to the optical receiving surface of LGP; One second inclination pattern, it is formed on the molded surface with an opposite angles with respect to the first inclination pattern.

Scattering pattern may comprise further that one forms and be parallel to the horizontal pattern at described edge at molded surface.

The first and second inclination patterns can tilt in the opposite direction with respect to the straight line of vertical this horizontal pattern of what, and this angle that tilts in the opposite direction is 5 ° to 60 °.

Can form scattering pattern in described edge.

Can begin to push away from edge and pull out scattering pattern.

Molded surface can be through blasting treatment.

According to a third aspect of the invention we, provide a kind of method of making the LGP of back light unit, described method comprises: form a top main core, it is used for the light exit surface of molded light guide plate; Form main core, it is used for the basal surface of molded light guide plate; By being installed at the mould bases place, described upper and lower main core assembles a molding outer casing; With come molded light guide plate by using this to assemble the molding outer casing of finishing, wherein, the formation top main core comprises: form one first inclination pattern on the molded surface of top main core, and form one second inclination pattern with respect to the first inclination pattern with an opposite angles on molded surface.

On molded surface, can further form a horizontal pattern.

Can begin from the edge of top main core to push away and pull out first and second for the inclination patterns, described edge be corresponding to the optical receiving surface of LGP.

Can be at isolated edge 20mm to the distance of 50mm with the interior formation first and second inclination patterns.

Described method can further comprise the described molded surface of sandblast.

Description of drawings

Describe exemplary embodiments of the present invention in detail with reference to accompanying drawing, of the present invention above-mentioned apparent with further feature and advantage general.

Fig. 1 is the decomposition diagram of downward back light unit conventionally;

Fig. 2 is the figure that the Luminance Distribution that is occurred when the LGP among Fig. 1 is used in the downward back light unit conventionally has been described;

Fig. 3 is a flow chart, and the process according to the LGP of the back light unit of the first embodiment of the present invention is made in its explanation;

Fig. 4 is a perspective view, and its explanation forms the operation of horizontal pattern on top main core in the illustrated process of Fig. 3.

Fig. 5 is a perspective view, and its explanation forms the operation of inclination pattern on top main core after the operation illustrated by Fig. 4 forms the prism model.

Fig. 6 is a plane, and its explanation is by the distribution and the shape of formed model on the illustrated molded surface that operates in top main core of Fig. 4 and Fig. 5.

Fig. 7 is the figure of operation of the molded surface of explanation sandblast top main core.

Fig. 8 is the vertical sectional view of a mould bases, wherein installs main core according to one embodiment of the invention.

Fig. 9 is by the perspective view according to the LGP of the process manufacturing of the first embodiment of the present invention.

Figure 10 is the photo that the Luminance Distribution that is occurred when the LGP among use Fig. 9 in back light unit has been described.

Figure 11 is a flow chart, and it has illustrated the process of making the LGP that is used for back light unit according to a second embodiment of the present invention.

Figure 12 is a flow chart, and it has illustrated that a third embodiment in accordance with the invention manufacturing is used for the process of the LGP of back light unit.

Figure 13 is a plane, and it has illustrated the distribution and the shape of the model that forms on the molded surface at top main core during the illustrated process of Figure 12.

Figure 14 is a flow chart, and it has illustrated that a fourth embodiment in accordance with the invention manufacturing is used for the process of the LGP of back light unit.

Figure 15 is by the perspective view according to the LGP of the process manufacturing of the of the present invention the 3rd or the 4th embodiment.

Figure 16 is the fragmentary, perspective view of top main core of light exit surface that is used for the molded LGP that is used for back light unit according to a fifth embodiment of the invention.

Figure 17 is the side sectional view of top main core illustrated in fig. 16.

Figure 18 is the chart of detailed dimensions that the staged pattern of top main core illustrated in fig. 17 has been described.

Figure 19 is the plane of top main core illustrated in fig. 16.

Figure 20 is the vertical sectional view that the mould bases of top main core according to a fifth embodiment of the invention wherein has been installed.

Figure 21 is to use the side sectional view of the LGP of top main core manufacturing according to a fifth embodiment of the invention.

Figure 22 is the perspective view of LGP illustrated in fig. 21.

Figure 23 is to use the side sectional view of the modified LGP of top main core manufacturing according to a fifth embodiment of the invention.

The specific embodiment

Now, with reference to the accompanying drawing that shows exemplary embodiments of the present invention the present invention is described more completely.Yet, the present invention can be with many multi-form specialize, and should not be construed as and be limited to the embodiment that this paper sets forth, or rather, provide these embodiment so that the content that is disclosed is detailed and complete, and will pass on notion of the present invention to the those skilled in the art all sidedly.

The present invention proposes a kind of top main core of the LGP that is used for molded back light unit, and is a kind of by using top main core to make method and a kind of back light unit by described method manufacturing of described LGP.

Fig. 3 is a flow chart, and its explanation is according to the manufacture process of the LGP of the back light unit of the first embodiment of the present invention.

With reference to Fig. 3, manufacture process comprises: one forms the routine operation of main core down, and described main core down is used for the basal surface (not shown) of molded light guide plate; One forms and to be used for the operation S1 of top main core of light exit surface of molded light guide plate; One by installing the operation S2 that upper and lower main core is assembled molding outer casing in a mould bases; One by using the molding outer casing of being assembled to come the operation S3 of injection moulding LGP.

Operation S1 comprises: time operation S1a that forms a horizontal pattern on the molded surface of top main core, time operation S1b of formation one and the horizontal pattern first inclination pattern at angle on molded surface, on molded surface, form one and become time operation Sb of the molded surface of time operation S1c of the second inclination pattern at a diagonal angle and a sandblast top main core with respect to the first inclination pattern.

Here, can be before inferior operation S1b and S1c and form time operation S1a afterwards.

Use routine techniques to carry out routine operation, therefore briefly omitted the detailed description of routine techniques for the sake of simplicity.However, this kind routine techniques is still incorporated among the present invention.Carry out routine operation and operation S1 independently.Because the upper and lower main core that finally obtains is to be installed in the mould bases independently, so can at first carry out in two operations any one.If necessary, can further use a slide core to come fixed model on the optical receiving surface of molded light guide plate.

Fig. 4 is a perspective view, and it has illustrated during the operation S1 illustrated in fig. 3, forms time operation S1a of horizontal pattern on top main core.

In Fig. 4, for the size of understanding the present invention and top main core 100 better by comparison, amplified the size of horizontal pattern 105 widely.

With reference to Fig. 4, on the molded surface 103 of top main core 100, form horizontal pattern 105, make in this way in X-direction to begin to extend from whose surfaces 102 corresponding to the optical receiving surface of LGP.By repeatedly using a lathe tool 104 horizontal pattern 105 to be shaped, so that have continuous parallel groove in X-direction cutting mould control surface 103.

That is to say that horizontal pattern 105 comprises a plurality of horizontal tongues.Distance between adjacent tongue " p " can be 0.5mm.The width of tongue " 2r " can be 0.3mm.

In the edge of release wicking surface 102 " l " distance with the horizontal pattern 105 of interior formation.Distance " l " can be 20mm to 50mm.Simultaneously, lathe tool 104 preferably has a circular cutting torch, and it is used for forming has the tongue of a 3R to the degree of depth of 5R.

The shape of horizontal pattern 105 is not restricted to above-mentioned shape.For instance, can there be distance between adjacent tongue.That is to say that distance " p " can be zero.

Fig. 5 is the perspective view of an explanation time operation S1b and S1c.

In Fig. 5, concentrate on the explanation of aspect, cutting angle is used for forming the first and second inclination patterns on top main core 100 time operation S1b and S1c.

With reference to Fig. 5,, first and second models prepared a lathe tool 126 for being shaped.Lathe tool 126 can be the same with the lathe tool 104 that is used to horizontal pattern 105 is shaped.Yet lathe tool 126 preferably is different from lathe tool 104, because lathe tool 126 has the cutting angle different with lathe tool 104.

Begin to make the inclination pattern forming from whose surfaces 102 corresponding to the optical receiving surface of LGP.Correspondingly, form the inclination pattern in the edge that the light exit surface and the optical receiving surface of LGP meets the boundary.

To and Y-axis (that is, with the vertical direction of horizontal pattern 105) become the direction of predetermined angular to form the inclination pattern.Thereby, form the inclination pattern so that and horizontal pattern 105 overlapping, and overlapping model forms an asterisk type (" * ") model.

Equally, when forming horizontal pattern after the inclination pattern, resulting overlay model also forms asterisk type (" * ") model.

The mobile route that is used for forming the lathe tool 126 of the first inclination pattern be to Y-axis at angle the direction of " a " tilt.Form the second inclination pattern to the direction that becomes a diagonal angle " a " with Y-axis.

That is to say that lathe tool 126 at first moves to the direction that becomes clockwise angle " a " with Y-axis and forms the first inclination pattern on the XY plane, on the XY plane, move then and form the second inclination pattern to the direction that becomes counterclockwise angle " a " with Y-axis.Perhaps, lathe tool 126 can at first move to the direction that becomes counterclockwise angle " a " with Y-axis and form the second inclination pattern, can move to the direction that becomes clockwise angle " a " with Y-axis then and form the first inclination pattern.That is to say, can at first form any one of the first and second inclination patterns.

In addition, to becoming the direction of a predetermined angular to move up so that the inclination pattern rises from initial cuts point with the Z axle.As shown in Figure 5, lathe tool 126 from the initial cuts point of whose surfaces 102 to become the direction of predetermined angular " b " to move up with the Z axle.Correspondingly, the degree of depth of inclination pattern begins to reduce from whose surfaces 102, thereby beginning to push away from whose surfaces 102 pulls out the inclination pattern.

Thereby, when using the top main core molded light guide plate of said structure, on LGP, forming the inclination pattern, it begins to push away from the edge that the light exit surface and the optical receiving surface of LGP meet the boundary and pulls out in this way.

Determine that preferably predetermined angular " b " can be at release wicking surface 10220mm in the scope of 50mm so that wherein form the length " l " in the zone of inclination pattern.Therefore, lathe tool 126 is along coming cutting mould control surface 103 with a predetermined angular to the path movement that the Y/Z axle tilts, thereby forms the first inclination pattern and the second inclination pattern.

Here, the first inclination pattern can become the direction of a counterclockwise angle " a " and form with Y-axis, and the second inclination pattern can become the direction of a clockwise angle " a " with Y-axis and form.That is to say that term " the first inclination pattern " only is used for distinguishing these two different inclination patterns with " the second inclination pattern ".

With the tongue of a desired depth " t " formation inclination pattern, and angle " a " is preferably 5 ° to 60 °.Therefore, angle " b " can be calculated by equation [tan b=t/l].

Fig. 6 is a plane, and its explanation is by the distribution and the shape of the model that forms on the illustrated molded surface that operates in top main core of Fig. 4 and Fig. 5.

With reference to Fig. 6, release wicking surface 102l distance makes it superpose with horizontal pattern 105 each other in this way, thereby forms an asterisk type (" * ") scattering pattern 110 to form the first inclination pattern and the second inclination pattern in the interior zone on horizontal pattern 105.

Fig. 7 is the figure of time operation Sb of the molded surface 103 of explanation sandblast top main core 100.After forming horizontal pattern 105 and inclination pattern on the molded surface 103,, thereby further strengthen scattering effect with the resulting molded surface 103 of a sand-blast material sandblast.

Can form top main core 100 by Stavax (extraordinary transparent minute surface steel), and nickel plating thereon.

Fig. 8 is the vertical sectional view that above-mentioned molding outer casing through structurized top main core has been installed.

With reference to Fig. 8, in the mode of molded surface 103 top main core 100 is installed on the top mold frame 140, thereby forms a molding outer casing that is used for the injection moulding LGP towards molding space 132.Although do not describe in detail, will be installed to down on the mould bases 130 with the following main core 142 that a reservation shape forms, and side cores 144 is installed on the surface, inside of mould bases sidewall.

Correspondingly, the molding space 132 that formation and needed LGP size match between lower and upper mould bases 130 and 140.Although do not show in the accompanying drawings, in molding space 132, come molded needed LGP by the injection-molded material of a Coinjection molding apparatus.

Mould bases is not limited to only comprise the structure of upper and lower mould bases.For instance, under the situation of mould bases, can use an independent mould bases and an independent moulding core extraly with a slide core.

Fig. 9 is the perspective view by the LGP of process manufacturing illustrated in fig. 3.

With reference to Fig. 9,, light source 206 has been described for the convenience that illustrates and understand.One molded LGP 202 comprises: a upper surface, and just by the molded light exit surface 203 of top main core 100, with a lower surface, just by the molded basal surface 204 of main core down 142.

Forming an asterisk type scattering pattern 210 from optical receiving surface 205 1 preset distances continuously in interior zone on the light exit surface 203, it is corresponding to the scattering pattern 110 of top main core 100.Correspondingly, asterisk type scattering pattern 210 comprises horizontal pattern 205 and inclination pattern 208 and 209.Form a sandblast pattern in the zone away from optical receiving surface 205 1 preset distances or bigger distance on light exit surface 203.

By this structure of LGP 202, the asterisk type scattering pattern 210 by light exit surface 203 will receive the light scattering effectively of LGP 202 from light source 206 by optical receiving surface 205, then by light exit surface 203 with its emission.Correspondingly, reduced undesirable bright line of light widely, it passes the prismatic lens that is arranged in LGP 202 tops.

Figure 10 is the photo that the Luminance Distribution that occurs when the LGP among use Fig. 9 in back light unit has been described.

As shown in figure 10, because at the asterisk type scattering pattern 210 near formation on the light exit surface 203 at optical receiving surface 205 places, bright line has reduced, thereby has caused uniform brightness.

With reference to Figure 11, manufacture process comprises: form and to be used for the routine operation (not shown) of following main core of basal surface of molded light guide plate, one forms and to be used for the operation S1 ' of top main core of light exit surface of molded light guide plate, by operation S2 that upper and lower main core assembles molding outer casing is installed and in a mould bases by using the operation S3 of the molding outer casing injection moulding LGP of being assembled.

Operation S1 ' comprising: time operation Sb of the whole molded surface of sandblast top main core, on the molded surface of top main core, form time operation S1a of a horizontal pattern, on molded surface, form one and time operation S1b of the horizontal pattern first inclination pattern at angle, and on molded surface, form one and become time operation S1c of the second inclination pattern at a diagonal angle with respect to the first inclination pattern.

Because after inferior operation Sb, carry out time operation S1a, S1b and S1c, so operation S1 ' is different from operation S1 slightly.

Similar with first embodiment, can after inferior operation S1b and S1c, carry out time operation S1a.

With reference to Figure 12, manufacture process comprises: form and to be used for the routine operation (not shown) of following main core of basal surface of molded light guide plate, one forms and to be used for the operation S1 of top main core of light exit surface of molded light guide plate "; by operation S2 that upper and lower main core assembles molding outer casing is installed and in a mould bases by using the molding outer casing of being installed to come the operation S3 of injection moulding LGP.

Operation S1 " comprising: form one and time operation S1b of the horizontal pattern first inclination pattern at angle on molded surface; form one and become time operation Sb of the whole molded surface of time operation S1c of the second inclination pattern at a diagonal angle and sandblast top main core with respect to the first inclination pattern on molded surface.

Because ignored time operation S1a that forms horizontal pattern, " be different from operation S1 and operation S1 ' so operation S1.Correspondingly, formed a rhombus scattering pattern by the mutual stack of the first and second inclination patterns.

With reference to Figure 13, on the molded surface 103 of top main core 103 release wicking surface 102l distance to form the first inclination pattern and the second inclination pattern in the interior zone, its mutual superposition in this way, thus formation rhombus scattering pattern 110 '.

The angulation of inclination pattern with the zone substantially with first embodiment in identical.

With reference to Figure 14, except time operation of execution before inferior operation S1b and the S1c, the manufacture process manufacture process with the 3rd embodiment substantially is identical.

With reference to Figure 15,, light source 206 has been described for the convenience that illustrates and understand.One molded LGP 202 comprises: a upper surface, and promptly by the molded light exit surface 203 of top main core 100, with a lower surface, promptly by the molded basal surface 204 of main core down 142.

On the light exit surface 203 from optical receiving surface 205 1 preset distances form continuously in interior zone rhombus scattering pattern 210 ', it is corresponding to the scattering pattern 110 of top main core 100.Correspondingly, rhombus scattering pattern 210 ' comprise inclination pattern 208 and 209.On light exit surface 203 away from the zone of optical receiving surface 205 1 preset distances or bigger distance with interior formation sandblast pattern.

By this structure of LGP 202, the rhombus scattering pattern 210 by light exit surface 203 ' will receive the light scattering effectively of LGP 202 from light source 206 by optical receiving surface 205, then by light exit surface 203 with its emission.Correspondingly, reduced undesirable bright line of light widely, it passes the prismatic lens that is arranged in LGP 202 tops.

Figure 16 is according to a fifth embodiment of the invention a fragmentary, perspective view of top main core of light exit surface that is used for molded light guide plate, and Figure 17 is the side sectional view of top main core illustrated in fig. 16.

With reference to Figure 16 and 17, top main core 302 is rough sheets, and is hexahedral shape more accurately.Top main core 302 has a molded surface 310, and it is as the molded surface 310 of the light exit surface of molded light guide plate.On the inner surface of top mold frame, install main core 302, so molded surface 310 is used for the light exit surface of molded light guide plate.

Top main core 302 further has whose surfaces 304 and core side surface 314.

Molded surface 310 comprises that an inclined surface 308 and that rises to whose surfaces 304 is connected to the plane surface 306 of the lower end of inclined surface 308.That is to say, form inclined surface 308 dropping to a line from an edge that meets the boundary with whose surfaces 304, and form described plane surface to extend from straight line away from edge one preset distance.

Preset distance is expressed as " l ", and the height of 308 upper end is expressed as " h " from plane surface 306 to inclined surface.That is to say that inclined surface has a horizontal length " l " and a height " h ".

On the whole zone of inclined surface 308, form a staged pattern 312.

Figure 18 is the chart that the detailed dimensions of staged pattern 312 has been described.

The detailed dimensions that note that staged pattern 312 only is exemplary, should not be construed as restriction or constraint.

With reference to Figure 18, vertical axis is represented the height " h " of inclined surface 308 from plane surface 306, and trunnion axis is represented the horizontal range " l " of release wicking surface 304.As shown in Figure 18, inclined surface 308 does not tilt with a fixed angle, forms quadratic function figure but be configured roughly.

In detail, the inclination angle of inclined surface 308 little by little is reduced to boundary line between inclined surface 308 and the planar line 306 from whose surfaces 304.Equally, configuration staged pattern 312 is to comprise horizontal surface and inclined surface.

The horizontal total length " l " of staged pattern 312 is 20mm, and the total height of staged pattern 312 " h " is 10 microns, and the horizontal length of a pair of horizontal surface of staged pattern 312 and inclined surface is 1mm.

The height of the inclined surface of staged pattern 312 (height difference between the adjacent level surface of model 312 just) is reduced to boundary line between inclined surface 308 and the planar line 306 gradually from whose surfaces 304.In detail, the height of the inclined surface on the left side is 0.9 micron, and the height of rightmost inclined surface is 0.05 micron, and the height of each inclined surface reduces towards the right with the form of quadratic function.

Figure 19 is the plane of top main core illustrated in fig. 16.

With reference to Figure 19, configuration molded surface 310 comprises inclined surface 308 and plane surface 306.The horizontal length of inclined surface 308 is corresponding to the preset distance " l " of release wicking surface 304.Configuration inclined surface 308 comprises described staged pattern 312.Configuration staged pattern 312 comprises a plurality of plane surface 312a and a plurality of inclined surface 312b.Here, a pair of horizontal surface of staged pattern 312 and the horizontal length of inclined surface are steady state values, for example, and 1mm.

The top main core 302 that is above disposed is installed on the inner surface of the top mold frame of a molding outer casing.When a kind of moulding material of injection in the inner space of molding outer casing the time, top main core 302 is used for the light exit surface of molded LGP corresponding to its molded surface 310.

Preferably, form top main core 302 by Stavax, and nickel plating thereon.

Figure 20 is the vertical sectional view that the mould bases of top main core 302 has been installed.

With reference to Figure 20, in the mode of molded surface 310 top main core 302 is installed on the top mold frame 340, thereby forms a molding outer casing that is used for the injection moulding LGP towards molding space 332.Following mould bases 330 has sidewall, and it can provide one than bigger space, main core 300 desired spaces down is installed.Although do not describe in detail, will be installed to down on the mould bases 330 with the following main core 300 that a reservation shape forms, and side cores 344 is installed on the surface, inside of mould bases sidewall.

Correspondingly, the molding space 332 that formation and needed LGP size match between lower and upper mould bases 340 and 330.Although do not show in the accompanying drawings, in molding space 332, come molded needed LGP by the injection-molded material of a Coinjection molding apparatus.

Mould bases is not limited to only comprise the structure of upper and lower mould bases.For instance, under the situation of the mould bases with a slide core of the optical receiving surface that is used for molded light guide plate, can use an independent mould bases and an independent moulding core extraly.

As illustrated in fig. 20, at the end formation inclined surface 308 of top main core 302.Project upwards at Figure 16 and 17 medium dip surfaces 308.Yet, because top main core 302 in Figure 16 and 17 has been installed on the inner surface of following mould bases 340 upside down, so outstanding downwards on Figure 20 medium dip surface 308.

Figure 21 is to use the side sectional view of the LGP of molding outer casing manufacturing illustrated in fig. 20.

With reference to Figure 21, corresponding to the molding space 332 formation LGPs of molding outer casing.That is to say, form the light exit surface 410 of LGP corresponding to the molded surface 310 of top main core 302.Correspondingly, form a plane surface 406 corresponding to the plane surface 306 of molded surface 310, and on light exit surface 410, form inclined surface 408 corresponding to the inclined surface 308 of molded surface 310.Although do not show that in Figure 21 the shape with conic section on inclined surface 408 forms a plurality of staged patterns 412 (seeing Figure 22).Thickness is the LGP that ought only use in the place, a side of optical receiving surface 404 layout light source as the LGP that reduces gradually illustrated in fig. 22.This class LGP generally is installed in the back light unit of notebook LCD.

Figure 22 is the perspective view of LGP illustrated in fig. 21.

With reference to Figure 22,, light source 420 has been described for the convenience that illustrates and understand.One molded LGP 402 comprises: a upper surface, and promptly by the molded light exit surface 410 of top main core 402, with a lower surface, promptly by the molded basal surface 405 of main core down 300.

Forming staged pattern 412 from optical receiving surface 404 1 preset distances continuously in interior zone on the light exit surface 410, it is corresponding to the staged pattern 312 of molded surface 310.Form plane surface 406 in the zone away from optical receiving surface 404 1 specific ranges or bigger distance on light exit surface 410 corresponding to plane surface 306.

By this structure of LGP 402, the staged pattern 412 by light exit surface 410 will receive the light scattering effectively of LGP 402 from light source 420 by optical receiving surface 404, then by light exit surface 410 with its emission.Correspondingly, reduced undesirable bright line of light widely, it passes the prismatic lens that is arranged in LGP 402 tops.

The side sectional view that Figure 23 is to use top main core according to a fifth embodiment of the invention to make through the modification LGP.

With reference to Figure 23, on light exit surface 510, form inclined surface 508 and plane surface 506.Although in Figure 23, do not show, on inclined surface 508, form the staged pattern, it is corresponding to staged pattern illustrated in fig. 18.Different with the LGP among Figure 21, the LGP among Figure 23 has a fixed thickness.This class LGP generally is used in the back light unit of LCD monitor or LCD TV.

Similarly, the staged pattern by inclined surface 508 will receive light scattering effectively in the LGP by optical receiving surface 504, then by light exit surface 510 with its emission.Correspondingly, reduced undesirable bright line of light widely, it passes the prismatic lens that is arranged in the LGP top.

As described above, on a presumptive area of the light exit surface of LGP, form the light that asterisk type scattering pattern or rhombus scattering pattern come scattering effectively to receive.Therefore undesirable bright line and concealed wire can be prevented, thereby the Luminance Distribution in the whole zone of corresponding display floater can be kept equably.Equally because by the process of injection molding that uses top main core can be cheap price make this LGP that is used for back light unit in a large number, so it provides good production capacity again.

Equally, on the light exit surface of LGP, form the light that the staged pattern comes scattering effectively to receive in the zone of adjacent light receiving surface.Therefore undesirable bright line and concealed wire can be prevented, thereby the Luminance Distribution in the whole zone of corresponding display floater can be kept equably.

Though at large shown with reference to exemplary embodiments of the present invention and described the present invention, but it will be understood by one of ordinary skill in the art that and to carry out multiple change and not depart from spirit of the present invention and the category that limits by above claims form of the present invention and details.

Claims

1. LGP that is used for a back light unit is characterized in that it comprises:

One light exit surface, it launches light;

One basal surface, it is with respect to this light exit surface;

One optical receiving surface, it is disposed between the vertical end of one of this light exit surface vertically terminal and this basal surface and receives from the light of a light emitted of this back light unit; With

One scattering pattern, it forms on this light exit surface,

This scattering pattern comprises:

One first inclination pattern, it is formed on this light exit surface and with this optical receiving surface and presss from both sides a predetermined angular; With

One second inclination pattern, it is formed on this light exit surface with an opposite angles with respect to this first inclination pattern.

2. LGP as claimed in claim 1 is characterized in that wherein this scattering pattern further comprises a horizontal pattern, and it is formed on this light exit surface and is parallel to this optical receiving surface.

3. LGP as claimed in claim 2, wherein this first and second inclinations pattern tilts in the opposite direction with respect to the straight line of vertical this horizontal pattern of what, and this angle that tilts in the opposite direction is 5 ° to 60 °.

4. LGP as claimed in claim 1 or 2 is characterized in that wherein this scattering pattern is to form from the edge that this light exit surface is connected with this optical receiving surface.

5. LGP as claimed in claim 4 is characterized in that wherein this scattering pattern is to begin to push away from this edge to pull out.

6. LGP as claimed in claim 5, it is characterized in that this scattering pattern wherein from this edge 20mm to the distance of 50mm with interior formation.

7. LGP as claimed in claim 6 is characterized in that it comprises that more a sandblast pattern is formed on this optical receiving surface.

8. the top main core of a light exit surface that is used for a molded LGP that is used for a back light unit is characterized in that this top main core comprises:

One scattering pattern is formed on the one molded surface,

This scattering pattern comprises:

One first inclination pattern, it is formed on corresponding to becoming a predetermined angular on this molded surface of an optical receiving surface of this LGP and with one of this molded surface edge; With

One second inclination pattern, it is formed on this molded surface with an opposite angles with respect to this first inclination pattern.

9. top main core as claimed in claim 8 is characterized in that wherein this scattering pattern advances to comprise a horizontal pattern, and it is formed on this molded surface and is parallel to a edge corresponding to this optical receiving surface.

10. top main core as claimed in claim 9 it is characterized in that this first and second inclinations pattern wherein tilts in the opposite direction with respect to the straight line of vertical this horizontal pattern of what, and this angle that tilts in the opposite direction is 5 ° to 60 °.

11. top main core as claimed in claim 10 is characterized in that wherein this scattering pattern begins from this edge to form.

12. top main core as claimed in claim 11 is characterized in that wherein this scattering pattern begins to push away from this edge to pull out.

13. top main core as claimed in claim 12, it is characterized in that wherein from this edge 20mm to the distance of 50mm with this scattering pattern of interior formation.

14. leaded light as claimed in claim 8 is characterized in that wherein this molded surface is through blasting treatment.

15. a manufacturing method of light conducting board that is used for a back light unit is characterized in that this method may further comprise the steps:

Form a top main core, it is used for a light exit surface of molded this LGP;

Form main core, it is used for a basal surface of molded this LGP;

By being installed at a mould bases place, this upper and lower main core assembles a molding outer casing;

Next molded this LGP of molding outer casing of finishing by using this to assemble,

Wherein the formation of this top main core comprises:

On a molded surface of this top main core, form one first inclination pattern; With

On this molded surface, form one second inclination pattern with respect to this first inclination pattern with an opposite angles.

16. method as claimed in claim 15 is characterized in that more being included in formation one horizontal pattern on this molded surface.

17. method as claimed in claim 16 it is characterized in that this first and second inclinations pattern wherein tilts in the opposite direction with respect to the straight line of vertical this horizontal pattern of what, and this angle that tilts in the opposite direction is 5 ° to 60 °

18. method as claimed in claim 17 is characterized in that wherein beginning to push away from an edge of this top main core pulling out this first and second inclinations pattern, this edge is corresponding to an optical receiving surface of this LGP.

19. method as claimed in claim 18, it is characterized in that wherein from this edge 20mm to the distance of 50mm with this first and second inclinations pattern of interior formation.

20. method as claimed in claim 15 is characterized in that it further comprises: this molded surface is carried out sandblast.