The default number of bumps is 100 (10 X 10). You need to change these @";zM&
parameters to match your design. Note that LightTools allows many other Re]7G.y
placement options, but you will use the Bezier placement option for this qf?X:9Wt
example. 3?Tk[m1b
5.On both the X Placement tab and Y Placement tab, change the Number of ?_BK(kL_
Bumps parameter to 300, as shown in the following figure. Click Apply after 7]pi .1i
each change. tMOhH
#
6.Click OK to close the dialog box. 1J?x2
Note that the number of bumps is 300 X 300, which results in about 90,000 $P bwC6>8
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a "qxu9Hg!
manner defined by the Bezier parameterization option. Please see Chapter 5 of =1e>$E#
the LightTools Core Module User’s Guide for more information. With the #57D10 j
current parameter values, the Bezier option varies the bump spacing along the 0hoi=W6AQ
length of the light guide. The spacing in the orthogonal direction is constant. $9Pscu bM4
The X and Y refer to the local coordinate system of the surface. J<27w3bs~p
LightTools Introductory Tutorial * 91 jFPD SR5
j" ~gEGfK
HAPTER 5 Introduction to Backlight Design m0 [JiwPI
C d"~-D;
Examining Surface Properties o3kVcX^
Using the methods described in previous chapters, you may want to check your }MCJ$=5
model before you run a simulation. %D
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Click on various parts of the model in the 3D Design View. Or use the System @/ G$
C9<
Navigator to select different surfaces and view their Properties. /gUD!@
1.In the System Navigator, click to open BottomSurface of the LightGuide, then z]33_[G1U
click Zones, and then click Texture. 9%6W_ 0>
2.Select SphericalElement, and then right-click and select Properties from the 0.kQqy~5
shortcut menu. The Shape tab shows you a graphical representation of the _7 P#?:h
spherical bump shape that is the bottom of the light guide. N2/t
You might be curious as to why you cannot see the 3D texture property zones you R0DWjN$j
defined. They are invisible by default, because drawing thousands of texture 5FQtlB9F
elements can make displaying and exploring the model somewhat slow. If you Di>B:=
choose to make them visible, 3D textures are displayed in wireframe, even if the , HHCgN
display mode is set to translucent. Wireframe rendering displays a bit faster and e%K
oecq
shows more of the technical details. BE LxaV,
92 * LightTools Introductory Tutorial o@ j)clf
YIZ+BVa
HAPTER 5 Introduction to Backlight Design C[IY9s:Pf
C w$j!89@)
1.Rotate and zoom the model to that you can see something like the illustration HHXm
4}!;<
below: ^!yJ;'H\
. l?J|Ip2W
2.To reveal the Property Zones: wD|I^y;
a.Right-click in the Design View and select View Preferences to display this 9aKt (g6
dialog box. ,'z=cB`+o
b.On the Visibility tab, click the Property Zone check box to turn it on. H I%#S&d
c.Click OK. c$AwJhl^]
You will see the wire frame rendering of the spherical bumps on the Z`{Z V5
bottom surface, and a solid color above it. The solid color is the 3D texture X|wg7>kh*`
of the BEFs (brightness-enhancing films) built automatically by the utility.
