The default number of bumps is 100 (10 X 10). You need to change these ;mLbgiqQ J
parameters to match your design. Note that LightTools allows many other Z*Jp?[##
placement options, but you will use the Bezier placement option for this Zlf)
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example. Xoq mT/P
5.On both the X Placement tab and Y Placement tab, change the Number of ;c ~%:|
Bumps parameter to 300, as shown in the following figure. Click Apply after >)`V $x
each change. /J` ZO$
6.Click OK to close the dialog box. k4Ub+F
Note that the number of bumps is 300 X 300, which results in about 90,000 lpHz*NZ0
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a u[ 2B0a
manner defined by the Bezier parameterization option. Please see Chapter 5 of k&8& D
the LightTools Core Module User’s Guide for more information. With the k>dzeH
current parameter values, the Bezier option varies the bump spacing along the b<?A
length of the light guide. The spacing in the orthogonal direction is constant. W!
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The X and Y refer to the local coordinate system of the surface. cp g+-Zf%
LightTools Introductory Tutorial * 91 4Hcds9y9
IL2OVL X
HAPTER 5 Introduction to Backlight Design !w -`:d?
C p:9^46N @
Examining Surface Properties +p#Q|o'
Using the methods described in previous chapters, you may want to check your ,.T k "\@
model before you run a simulation. cl3Dwrf?
Click on various parts of the model in the 3D Design View. Or use the System Ci?A4q$.
Navigator to select different surfaces and view their Properties. /QK H30E
1.In the System Navigator, click to open BottomSurface of the LightGuide, then p{k^ )5CR/
click Zones, and then click Texture. yM-3nwk
2.Select SphericalElement, and then right-click and select Properties from the _/
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shortcut menu. The Shape tab shows you a graphical representation of the U6Ws#e
spherical bump shape that is the bottom of the light guide. S((\KL,
You might be curious as to why you cannot see the 3D texture property zones you _ZU.;0
defined. They are invisible by default, because drawing thousands of texture T)"LuC#C
elements can make displaying and exploring the model somewhat slow. If you =h se2f
choose to make them visible, 3D textures are displayed in wireframe, even if the /6Vn WrN_
display mode is set to translucent. Wireframe rendering displays a bit faster and
ra*(.<&
shows more of the technical details. +`H{
92 * LightTools Introductory Tutorial G'qGsKf\
6} 9`z8
HAPTER 5 Introduction to Backlight Design tfb_K4h6,
C o(_~
s t<
1.Rotate and zoom the model to that you can see something like the illustration #>/s tU-
below: 4|[)D/N
. FY6!)/P0I7
2.To reveal the Property Zones: mfpL?N
a.Right-click in the Design View and select View Preferences to display this (fJ. o-LQ
dialog box. F;@A2WD
b.On the Visibility tab, click the Property Zone check box to turn it on. :VEy\ R>W
c.Click OK. = $t
You will see the wire frame rendering of the spherical bumps on the f-b#F2I
bottom surface, and a solid color above it. The solid color is the 3D texture |w7D&p$
of the BEFs (brightness-enhancing films) built automatically by the utility.
