The default number of bumps is 100 (10 X 10). You need to change these o$-8V: )6d
parameters to match your design. Note that LightTools allows many other Bnxzy
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placement options, but you will use the Bezier placement option for this *V" cu
example. ~l}TlRqL
5.On both the X Placement tab and Y Placement tab, change the Number of s)M2Z3>+
Bumps parameter to 300, as shown in the following figure. Click Apply after D 1hKjB&
each change. KT g$^"\
6.Click OK to close the dialog box. l[fNftT-
Note that the number of bumps is 300 X 300, which results in about 90,000 2Qy !Aa
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ASYUKh,h
manner defined by the Bezier parameterization option. Please see Chapter 5 of &^uzg&,;
the LightTools Core Module User’s Guide for more information. With the >6kWmXK[
current parameter values, the Bezier option varies the bump spacing along the 1I@4xC
#X
length of the light guide. The spacing in the orthogonal direction is constant. I Mv^ 9T:
The X and Y refer to the local coordinate system of the surface. x# YOz7.
LightTools Introductory Tutorial * 91 v;RQVH;,
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HAPTER 5 Introduction to Backlight Design n]$vCP
C ~.@fk}'R
Examining Surface Properties O UdeQO?
Using the methods described in previous chapters, you may want to check your C 3b'Q
model before you run a simulation. iZSSd{jO
Click on various parts of the model in the 3D Design View. Or use the System 0}^-, Q,
Navigator to select different surfaces and view their Properties. hx2C<;s4
1.In the System Navigator, click to open BottomSurface of the LightGuide, then *x l7;s
click Zones, and then click Texture. b?bYPN+
2.Select SphericalElement, and then right-click and select Properties from the @"/}Al
shortcut menu. The Shape tab shows you a graphical representation of the g-:)} 8d6
spherical bump shape that is the bottom of the light guide. {tT` It
You might be curious as to why you cannot see the 3D texture property zones you nEp'l.T
defined. They are invisible by default, because drawing thousands of texture Y( :OfC?
elements can make displaying and exploring the model somewhat slow. If you g~y9j8 8?
choose to make them visible, 3D textures are displayed in wireframe, even if the n47=eKd70
display mode is set to translucent. Wireframe rendering displays a bit faster and =3zn
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shows more of the technical details. a:| 4q
92 * LightTools Introductory Tutorial ; OPCBd r
]8_h9ziz
HAPTER 5 Introduction to Backlight Design Zn/9 BO5
C TcP1"wc
1.Rotate and zoom the model to that you can see something like the illustration ,|4Ye
below: R^2Uh$kk{A
. QlS5B.h,
2.To reveal the Property Zones: ATzNV=2s
a.Right-click in the Design View and select View Preferences to display this b$
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dialog box. op|mRJBq;
b.On the Visibility tab, click the Property Zone check box to turn it on. wrO>#`Z
c.Click OK. R|CY4G
j
You will see the wire frame rendering of the spherical bumps on the Fm;)7.%
>
bottom surface, and a solid color above it. The solid color is the 3D texture ^kl9U+
of the BEFs (brightness-enhancing films) built automatically by the utility.
