The default number of bumps is 100 (10 X 10). You need to change these jL o(Uf
parameters to match your design. Note that LightTools allows many other lHQ:LI
placement options, but you will use the Bezier placement option for this ^=`7]E [p
example. ea[vzD]
5.On both the X Placement tab and Y Placement tab, change the Number of Z>
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Bumps parameter to 300, as shown in the following figure. Click Apply after l*~O;do
each change. 4Bg"b/kF
6.Click OK to close the dialog box. F3+
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Note that the number of bumps is 300 X 300, which results in about 90,000 m_YXTwwx
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a #0>??]& r
manner defined by the Bezier parameterization option. Please see Chapter 5 of Y1fcp _]m
the LightTools Core Module User’s Guide for more information. With the U|SF;T
.
current parameter values, the Bezier option varies the bump spacing along the C'$w*^me
length of the light guide. The spacing in the orthogonal direction is constant. hS&3D6G t
The X and Y refer to the local coordinate system of the surface. 4FrP%|%E~
LightTools Introductory Tutorial * 91 xe?!UCUb@
BV)o F2b:
HAPTER 5 Introduction to Backlight Design m#6RJbEz
C "i>?Tg^
Examining Surface Properties S;@nPzhc
Using the methods described in previous chapters, you may want to check your `R[cM; c2
model before you run a simulation. v2eLH:6
Click on various parts of the model in the 3D Design View. Or use the System `|kW%L4
Navigator to select different surfaces and view their Properties. 8R|!$P
1.In the System Navigator, click to open BottomSurface of the LightGuide, then t Sibz l~
click Zones, and then click Texture. TL u+5f
2.Select SphericalElement, and then right-click and select Properties from the p1t qwV
shortcut menu. The Shape tab shows you a graphical representation of the p GZiADT
spherical bump shape that is the bottom of the light guide. $ fifx>!
You might be curious as to why you cannot see the 3D texture property zones you lRA =IRQ]
defined. They are invisible by default, because drawing thousands of texture +}3l$L'bY
elements can make displaying and exploring the model somewhat slow. If you FK;3atrz
choose to make them visible, 3D textures are displayed in wireframe, even if the (4]M7b[S$
display mode is set to translucent. Wireframe rendering displays a bit faster and xf2| 9Tqt
shows more of the technical details. u%m,yPU ~B
92 * LightTools Introductory Tutorial `>ppDQaS)W
rfo7\'yk
HAPTER 5 Introduction to Backlight Design WSEw:pln
C suOWmqLs
1.Rotate and zoom the model to that you can see something like the illustration xhcFZTj/(
below: lo!^h]iE !
. T)c<tIr6
2.To reveal the Property Zones: Q Ev7k
a.Right-click in the Design View and select View Preferences to display this _(7f0p
dialog box. \-?0 ab3Z
b.On the Visibility tab, click the Property Zone check box to turn it on. wW kMvs
c.Click OK. a
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You will see the wire frame rendering of the spherical bumps on the Ww=^P{q\
bottom surface, and a solid color above it. The solid color is the 3D texture r=}v`
R&
of the BEFs (brightness-enhancing films) built automatically by the utility.
