The default number of bumps is 100 (10 X 10). You need to change these @>M8 Pe
parameters to match your design. Note that LightTools allows many other Tld1P69(
placement options, but you will use the Bezier placement option for this kw 6cFz
example. r hiS
5.On both the X Placement tab and Y Placement tab, change the Number of D/gd
Bumps parameter to 300, as shown in the following figure. Click Apply after "kc pA#uD|
each change. os }b?I*K
6.Click OK to close the dialog box. "| (rVj=
Note that the number of bumps is 300 X 300, which results in about 90,000 {9h`$e=
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a |P^]@om
manner defined by the Bezier parameterization option. Please see Chapter 5 of AF6d#Klog
the LightTools Core Module User’s Guide for more information. With the \Y51KB\
current parameter values, the Bezier option varies the bump spacing along the _= o1?R
length of the light guide. The spacing in the orthogonal direction is constant. "Q3PC!7X:5
The X and Y refer to the local coordinate system of the surface. x1 .3W j
LightTools Introductory Tutorial * 91 #S@UTJa
>Y,/dyT
Zm
HAPTER 5 Introduction to Backlight Design _L?v6MTj
C C<r(-qO{5
Examining Surface Properties 'q{PtYr
Using the methods described in previous chapters, you may want to check your 8FxcI!A@
model before you run a simulation. l5{(z;xM
Click on various parts of the model in the 3D Design View. Or use the System &?KPu? 9
Navigator to select different surfaces and view their Properties. ^^n +
1.In the System Navigator, click to open BottomSurface of the LightGuide, then wrz+2EP`
click Zones, and then click Texture. Bv2z4D4f+
2.Select SphericalElement, and then right-click and select Properties from the kb/| ;!
shortcut menu. The Shape tab shows you a graphical representation of the )9; (>cdl
spherical bump shape that is the bottom of the light guide. 1 ;_{US5FR
You might be curious as to why you cannot see the 3D texture property zones you 5u'Tm LuKT
defined. They are invisible by default, because drawing thousands of texture @/CRIei
elements can make displaying and exploring the model somewhat slow. If you fQ=&@ >e
choose to make them visible, 3D textures are displayed in wireframe, even if the XD;15a
display mode is set to translucent. Wireframe rendering displays a bit faster and lAdOC5+JX
shows more of the technical details. 4( ` 2#
92 * LightTools Introductory Tutorial w^ixMn~nLF
A rNur~
HAPTER 5 Introduction to Backlight Design l@,); w=_P
C Z-N-9E
1.Rotate and zoom the model to that you can see something like the illustration V pug"aR&_
below: y f
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2.To reveal the Property Zones: 2uvQf&,
a.Right-click in the Design View and select View Preferences to display this z1Bj_u{
dialog box. Gl?P.BCW.&
b.On the Visibility tab, click the Property Zone check box to turn it on. X@6zI-Y %
c.Click OK. {toyQ)C7
You will see the wire frame rendering of the spherical bumps on the el <<D
bottom surface, and a solid color above it. The solid color is the 3D texture /2g)Z!&+L
of the BEFs (brightness-enhancing films) built automatically by the utility.
