The default number of bumps is 100 (10 X 10). You need to change these }=|pl z}
parameters to match your design. Note that LightTools allows many other xNjWo*y v
placement options, but you will use the Bezier placement option for this Zgo%Jo
example. I3u)y|Y=
5.On both the X Placement tab and Y Placement tab, change the Number of D 4sp+
Bumps parameter to 300, as shown in the following figure. Click Apply after Z1.v%"/(
each change. }b]eiPWN
6.Click OK to close the dialog box. `1uGU[{ x
Note that the number of bumps is 300 X 300, which results in about 90,000 ; ,s9jw
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ZEso2|
manner defined by the Bezier parameterization option. Please see Chapter 5 of @M"(
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the LightTools Core Module User’s Guide for more information. With the -q\Rbb 5M
current parameter values, the Bezier option varies the bump spacing along the je%D &ci$
length of the light guide. The spacing in the orthogonal direction is constant. -b|"%e<'
The X and Y refer to the local coordinate system of the surface. qfjUJ/
LightTools Introductory Tutorial * 91 r1 b"ta
FIUQQQ\3
HAPTER 5 Introduction to Backlight Design eJeL{`NS
C d.HcO^
Examining Surface Properties !t} yoN
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Using the methods described in previous chapters, you may want to check your p(nE cu
model before you run a simulation. "C?H:8W
Click on various parts of the model in the 3D Design View. Or use the System = .w~qL
Navigator to select different surfaces and view their Properties. >`p?
CE
1.In the System Navigator, click to open BottomSurface of the LightGuide, then d{"@<0i?
click Zones, and then click Texture. hVAatn[
2.Select SphericalElement, and then right-click and select Properties from the hzT)5'_
shortcut menu. The Shape tab shows you a graphical representation of the L|B! ]}
spherical bump shape that is the bottom of the light guide. a ,"
You might be curious as to why you cannot see the 3D texture property zones you S&Q Xf<v
defined. They are invisible by default, because drawing thousands of texture zRbY]dW
elements can make displaying and exploring the model somewhat slow. If you `Y qXF=-
choose to make them visible, 3D textures are displayed in wireframe, even if the pw`'q(ad
display mode is set to translucent. Wireframe rendering displays a bit faster and 6b9J3~d\E
shows more of the technical details. ,RW`9+gx
92 * LightTools Introductory Tutorial lQEsa45
Ubgn^ +AI
HAPTER 5 Introduction to Backlight Design z:Z-2W V2o
C %k~e zn
1.Rotate and zoom the model to that you can see something like the illustration xP/q[7>#Q
below: hRMy a#%-
. X yiaRW
2.To reveal the Property Zones: q;UGiB^(A
a.Right-click in the Design View and select View Preferences to display this |* ^LsuF b
dialog box. @DF7j|]tV
b.On the Visibility tab, click the Property Zone check box to turn it on. >|yP`m
c.Click OK. ]"~
x
You will see the wire frame rendering of the spherical bumps on the PQa0m)H@
bottom surface, and a solid color above it. The solid color is the 3D texture OzwJ 52
of the BEFs (brightness-enhancing films) built automatically by the utility.
