The default number of bumps is 100 (10 X 10). You need to change these h2im
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parameters to match your design. Note that LightTools allows many other 3Pw %[q=g
placement options, but you will use the Bezier placement option for this nD^{Q [E6=
example. " 6 uTo0
5.On both the X Placement tab and Y Placement tab, change the Number of JS }_q1H
Bumps parameter to 300, as shown in the following figure. Click Apply after 9[6G8;<D&
each change. b\<lNE!L
6.Click OK to close the dialog box. <>ZB W9
Note that the number of bumps is 300 X 300, which results in about 90,000 DKe6? PG
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a u<BHf@AI
manner defined by the Bezier parameterization option. Please see Chapter 5 of $w 5#2Za
the LightTools Core Module User’s Guide for more information. With the V,99N' o~x
current parameter values, the Bezier option varies the bump spacing along the "H
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length of the light guide. The spacing in the orthogonal direction is constant. ,<R>Hiwg/s
The X and Y refer to the local coordinate system of the surface. R
(+h)#![
LightTools Introductory Tutorial * 91 Nv }U/$$S
6{Krw \0
HAPTER 5 Introduction to Backlight Design fU\k?'x_
C h0'8NvalQ
Examining Surface Properties 9;;]q?*
Using the methods described in previous chapters, you may want to check your }[XB]Xf
model before you run a simulation. 44<9zHK
Click on various parts of the model in the 3D Design View. Or use the System cij]&$;Q
Navigator to select different surfaces and view their Properties. +H2m<
1.In the System Navigator, click to open BottomSurface of the LightGuide, then FU [8:o62
click Zones, and then click Texture. r{; VTQ
2.Select SphericalElement, and then right-click and select Properties from the T%;k%
shortcut menu. The Shape tab shows you a graphical representation of the Ngm O0H
spherical bump shape that is the bottom of the light guide. IG2 `9rR
You might be curious as to why you cannot see the 3D texture property zones you kMfc"JXF
defined. They are invisible by default, because drawing thousands of texture :pL1F)-*
elements can make displaying and exploring the model somewhat slow. If you $9LGdKZ_D
choose to make them visible, 3D textures are displayed in wireframe, even if the &etL&s v
display mode is set to translucent. Wireframe rendering displays a bit faster and e
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shows more of the technical details. %RfY`n
92 * LightTools Introductory Tutorial llTQ\7zP
VuJfo9 `E
HAPTER 5 Introduction to Backlight Design 1 Ovx$ *
C tkm~KLWV&7
1.Rotate and zoom the model to that you can see something like the illustration B` t6H
below: 'P mHBQvt&
. XZUB* P}]D
2.To reveal the Property Zones: iMOPD}`IX
a.Right-click in the Design View and select View Preferences to display this Y%n{`9=
dialog box. T_5*iwI
b.On the Visibility tab, click the Property Zone check box to turn it on. 0{U ]STj
c.Click OK. df21t^0/
You will see the wire frame rendering of the spherical bumps on the !.tL"U~4
bottom surface, and a solid color above it. The solid color is the 3D texture B J:E,P`_
of the BEFs (brightness-enhancing films) built automatically by the utility.
