The default number of bumps is 100 (10 X 10). You need to change these IG@.W sM_
parameters to match your design. Note that LightTools allows many other qr> :meJy4
placement options, but you will use the Bezier placement option for this #B7_5y^
example. sevaNs
5.On both the X Placement tab and Y Placement tab, change the Number of ~=HrD?-99p
Bumps parameter to 300, as shown in the following figure. Click Apply after =#)Zm?[;
each change. = 7%1]
6.Click OK to close the dialog box. H9nVtS {x
Note that the number of bumps is 300 X 300, which results in about 90,000 U~!yGj F
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a F-i`GMWC
manner defined by the Bezier parameterization option. Please see Chapter 5 of Vk%[N>
the LightTools Core Module User’s Guide for more information. With the \uxDMKy
current parameter values, the Bezier option varies the bump spacing along the yVA<-PlS<
length of the light guide. The spacing in the orthogonal direction is constant. ,>(/}=Z.
The X and Y refer to the local coordinate system of the surface. bvdAOvxChW
LightTools Introductory Tutorial * 91 u l[ edp_
EHpIb j;n
HAPTER 5 Introduction to Backlight Design tXj28sh$
C CZ &VP%
Examining Surface Properties AIZs^
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Using the methods described in previous chapters, you may want to check your &k'J5YHm8H
model before you run a simulation. y bWb'+x
Click on various parts of the model in the 3D Design View. Or use the System C1=7.dPr
Navigator to select different surfaces and view their Properties. d+ FS
1.In the System Navigator, click to open BottomSurface of the LightGuide, then yZ7aH|Q81B
click Zones, and then click Texture. ! 63>I I
2.Select SphericalElement, and then right-click and select Properties from the 3Z?"M
shortcut menu. The Shape tab shows you a graphical representation of the y&8' V \
spherical bump shape that is the bottom of the light guide. j2GO ZKy
You might be curious as to why you cannot see the 3D texture property zones you D0T0Km/"
defined. They are invisible by default, because drawing thousands of texture 6J/"1 _
elements can make displaying and exploring the model somewhat slow. If you aD
yHIh8
choose to make them visible, 3D textures are displayed in wireframe, even if the yEYl Q= [#
display mode is set to translucent. Wireframe rendering displays a bit faster and O'tVZ!C#J
shows more of the technical details. Nb.AsIR^
92 * LightTools Introductory Tutorial CKJ9YKu{W
~!o\uTV r
HAPTER 5 Introduction to Backlight Design 6= ukR=]v
C V}?d
,.m`{
1.Rotate and zoom the model to that you can see something like the illustration CXC,@T
below: ` fw:
. C.SG m
2.To reveal the Property Zones: ?.E ixGzI^
a.Right-click in the Design View and select View Preferences to display this o`B,Pt5vu
dialog box. V&7jd7
2{
b.On the Visibility tab, click the Property Zone check box to turn it on. 8m? 9?OV5
c.Click OK. x13t@b
You will see the wire frame rendering of the spherical bumps on the :U^!N8i"=
bottom surface, and a solid color above it. The solid color is the 3D texture 4 VtI8f!
of the BEFs (brightness-enhancing films) built automatically by the utility.
