The default number of bumps is 100 (10 X 10). You need to change these )_:NLo:
parameters to match your design. Note that LightTools allows many other . me;.,$#
placement options, but you will use the Bezier placement option for this /xQTxh1;K
example. Kq!3wb;
5.On both the X Placement tab and Y Placement tab, change the Number of t:S+%u U
Bumps parameter to 300, as shown in the following figure. Click Apply after g 7| @
each change. ta0|^KAA
6.Click OK to close the dialog box. k'YTpO
Note that the number of bumps is 300 X 300, which results in about 90,000 "~nZ G iK
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Smh,zCc>s
manner defined by the Bezier parameterization option. Please see Chapter 5 of N#] ypl
the LightTools Core Module User’s Guide for more information. With the 0_/[k*Re
current parameter values, the Bezier option varies the bump spacing along the >~f]_puT
length of the light guide. The spacing in the orthogonal direction is constant. TvM~y \s
The X and Y refer to the local coordinate system of the surface. "tZe>> I
LightTools Introductory Tutorial * 91 m'U0'}Ld};
+t.b` U`-
HAPTER 5 Introduction to Backlight Design IBGrt^$M
C h1 RSVp+?n
Examining Surface Properties 54,er$$V
Using the methods described in previous chapters, you may want to check your jdN` mosJ
model before you run a simulation. =w JX 0A|
Click on various parts of the model in the 3D Design View. Or use the System F@t3!bj9
Navigator to select different surfaces and view their Properties. ,6/V" kqIP
1.In the System Navigator, click to open BottomSurface of the LightGuide, then f<_Cq <q"
click Zones, and then click Texture. mq l
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2.Select SphericalElement, and then right-click and select Properties from the R_KH"`q
shortcut menu. The Shape tab shows you a graphical representation of the z} <^jgJ
spherical bump shape that is the bottom of the light guide. r% _djUd
You might be curious as to why you cannot see the 3D texture property zones you :s,Z<^5a)g
defined. They are invisible by default, because drawing thousands of texture =|=(l)8
elements can make displaying and exploring the model somewhat slow. If you ~o(
choose to make them visible, 3D textures are displayed in wireframe, even if the kM 6
Qp
display mode is set to translucent. Wireframe rendering displays a bit faster and ]5O~+N f
shows more of the technical details. v19-./H^
j
92 * LightTools Introductory Tutorial W^Yxny
7$b1 <.WX
HAPTER 5 Introduction to Backlight Design #E?4E1 bnB
C "Q 0@/bYq
1.Rotate and zoom the model to that you can see something like the illustration w Y#E ?,
below: `uFdwO'DD
. <%d>v-=B
2.To reveal the Property Zones: Z;i:](
a.Right-click in the Design View and select View Preferences to display this ^~dWU>
dialog box. :/#rZPPF
b.On the Visibility tab, click the Property Zone check box to turn it on. 4 5e~6",
c.Click OK. QZ s! {sZ
You will see the wire frame rendering of the spherical bumps on the bOB \--:]
bottom surface, and a solid color above it. The solid color is the 3D texture Y*^[P,+J*}
of the BEFs (brightness-enhancing films) built automatically by the utility.
