The default number of bumps is 100 (10 X 10). You need to change these sP&E{{<QTF
parameters to match your design. Note that LightTools allows many other ^#Z(&/5f0
placement options, but you will use the Bezier placement option for this Cn{UzSKfs
example. o1g[(zky
5.On both the X Placement tab and Y Placement tab, change the Number of 97&6i TYA
Bumps parameter to 300, as shown in the following figure. Click Apply after DV.MvFV
each change. N4}h_mh^'
6.Click OK to close the dialog box. >l7
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Note that the number of bumps is 300 X 300, which results in about 90,000 WW_X:N~~e\
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a N C sUC
manner defined by the Bezier parameterization option. Please see Chapter 5 of lA ,%'+-
the LightTools Core Module User’s Guide for more information. With the oC?b]tzj
current parameter values, the Bezier option varies the bump spacing along the 1ii.nt1 u
length of the light guide. The spacing in the orthogonal direction is constant. i &KbzOY
The X and Y refer to the local coordinate system of the surface. XH*^#c
LightTools Introductory Tutorial * 91 oJR!0nQ
h*K hH>\
HAPTER 5 Introduction to Backlight Design Uex b>|
C {C6Yr9
Examining Surface Properties G.N3 R
Using the methods described in previous chapters, you may want to check your
m$c M+
model before you run a simulation. g 0 8
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Click on various parts of the model in the 3D Design View. Or use the System C1nQZtF R
Navigator to select different surfaces and view their Properties. t +#Ss v8
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 3 (<!pA
click Zones, and then click Texture. md2kZ.5u
2.Select SphericalElement, and then right-click and select Properties from the :kUH>O
shortcut menu. The Shape tab shows you a graphical representation of the LnL<W I*Pq
spherical bump shape that is the bottom of the light guide. 1|]-F;b
You might be curious as to why you cannot see the 3D texture property zones you D\T L6"wo
defined. They are invisible by default, because drawing thousands of texture V{*9fB#4 L
elements can make displaying and exploring the model somewhat slow. If you \"*l:x-u
choose to make them visible, 3D textures are displayed in wireframe, even if the ILpB:g
display mode is set to translucent. Wireframe rendering displays a bit faster and 1`uIjXr(
shows more of the technical details. !hc7i=V ?
92 * LightTools Introductory Tutorial aL`pvsnF
<)&yk cB
HAPTER 5 Introduction to Backlight Design h '}5 "m
C ywdNwNJ
1.Rotate and zoom the model to that you can see something like the illustration %NBD^g F
below: D"Xm9
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. ox*Ka]
2.To reveal the Property Zones: W=b5{
6
a.Right-click in the Design View and select View Preferences to display this zz9.OnZ~
dialog box. k^L (q\D
b.On the Visibility tab, click the Property Zone check box to turn it on. ,yT4(cMBk?
c.Click OK. Twk zX|
You will see the wire frame rendering of the spherical bumps on the HR}c9wy,q\
bottom surface, and a solid color above it. The solid color is the 3D texture *kIJv?%_}
of the BEFs (brightness-enhancing films) built automatically by the utility.
