The default number of bumps is 100 (10 X 10). You need to change these KGHq rc
parameters to match your design. Note that LightTools allows many other
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placement options, but you will use the Bezier placement option for this FE7)E.U
example. C. MoKa3
5.On both the X Placement tab and Y Placement tab, change the Number of ^}yg%+
Bumps parameter to 300, as shown in the following figure. Click Apply after 4A` NJ
each change. )x,8D ~p'
6.Click OK to close the dialog box. n}-3o]ku
Note that the number of bumps is 300 X 300, which results in about 90,000 'fwU]Hm
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 4 b]a&_-}
manner defined by the Bezier parameterization option. Please see Chapter 5 of { >{B`e`$
the LightTools Core Module User’s Guide for more information. With the "$HbK
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current parameter values, the Bezier option varies the bump spacing along the B ZK`O/
length of the light guide. The spacing in the orthogonal direction is constant. h( QYxI, |
The X and Y refer to the local coordinate system of the surface. }1 vT)
LightTools Introductory Tutorial * 91 ewsKH\#
nx":"LFI
HAPTER 5 Introduction to Backlight Design vm23U^VJ
C -]G(ms;}/Y
Examining Surface Properties y?
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Using the methods described in previous chapters, you may want to check your eBN)g^
model before you run a simulation. )o _j]K+xI
Click on various parts of the model in the 3D Design View. Or use the System -5G)?J/*
Navigator to select different surfaces and view their Properties. ]Al;l*yw
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 6 "j_iB
click Zones, and then click Texture. 2h 30\/xkU
2.Select SphericalElement, and then right-click and select Properties from the lVH<lp_ZtK
shortcut menu. The Shape tab shows you a graphical representation of the w[Gh+L30=5
spherical bump shape that is the bottom of the light guide. XV>JD/K2
You might be curious as to why you cannot see the 3D texture property zones you ER&UBUu"
defined. They are invisible by default, because drawing thousands of texture 4R +.N
elements can make displaying and exploring the model somewhat slow. If you <pLT'Y=
choose to make them visible, 3D textures are displayed in wireframe, even if the bJr[I
display mode is set to translucent. Wireframe rendering displays a bit faster and u?+bW-D'd
shows more of the technical details. pe0x""K
92 * LightTools Introductory Tutorial J<j&;:IRd
7iC *Pr
HAPTER 5 Introduction to Backlight Design /BKe+]dS*
C n;XWMY
1.Rotate and zoom the model to that you can see something like the illustration *mG`_9
below: VU|dV\>
. {C*\O)Gep
2.To reveal the Property Zones: (n(
fI f
a.Right-click in the Design View and select View Preferences to display this 92W&x'
dialog box. aiCFH_H4;L
b.On the Visibility tab, click the Property Zone check box to turn it on. V%
TH7@y
c.Click OK. L7Dh(y=;7
You will see the wire frame rendering of the spherical bumps on the "H MP$)d
bottom surface, and a solid color above it. The solid color is the 3D texture C}g9'jY
of the BEFs (brightness-enhancing films) built automatically by the utility.
