The default number of bumps is 100 (10 X 10). You need to change these j |'# 5H`
parameters to match your design. Note that LightTools allows many other N
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placement options, but you will use the Bezier placement option for this hDB`t
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example. UOLTCp?M;J
5.On both the X Placement tab and Y Placement tab, change the Number of ##`;Eh0a
Bumps parameter to 300, as shown in the following figure. Click Apply after f`u5\!}=!
each change. Pzk[^z$C
6.Click OK to close the dialog box. 2yJ7]+Jd7Y
Note that the number of bumps is 300 X 300, which results in about 90,000 A|
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bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a E2q B:
manner defined by the Bezier parameterization option. Please see Chapter 5 of xyS2_ Q
the LightTools Core Module User’s Guide for more information. With the '#McY'.D T
current parameter values, the Bezier option varies the bump spacing along the %|`:5s-T%
length of the light guide. The spacing in the orthogonal direction is constant. 2w x[D
The X and Y refer to the local coordinate system of the surface. cy &
LightTools Introductory Tutorial * 91 <nOuyGIZ
zfP[1
HAPTER 5 Introduction to Backlight Design Bt*&L[&57
C EbBv}9g
Examining Surface Properties
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Using the methods described in previous chapters, you may want to check your ^B<PD]
model before you run a simulation. uGP[l`f|FQ
Click on various parts of the model in the 3D Design View. Or use the System %)<oX9E
Navigator to select different surfaces and view their Properties. {p#l!P/
1.In the System Navigator, click to open BottomSurface of the LightGuide, then mJGO)u&
click Zones, and then click Texture. (s V]UGrZ
2.Select SphericalElement, and then right-click and select Properties from the rS F;Lp)}
shortcut menu. The Shape tab shows you a graphical representation of the 7 E!";HT
spherical bump shape that is the bottom of the light guide. lnS\5J
You might be curious as to why you cannot see the 3D texture property zones you r21?c|IP
defined. They are invisible by default, because drawing thousands of texture zH=/.31Q
elements can make displaying and exploring the model somewhat slow. If you <i{m.p R>
choose to make them visible, 3D textures are displayed in wireframe, even if the _q$0lqq~u
display mode is set to translucent. Wireframe rendering displays a bit faster and uS:
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shows more of the technical details. {*M>X}voS
92 * LightTools Introductory Tutorial !~lVv& YO
(1kn):
HAPTER 5 Introduction to Backlight Design DqurHQ z)m
C Y91
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1.Rotate and zoom the model to that you can see something like the illustration ~J:$g u~`
below: g)Vq5en*
. 2_o K 5*j
2.To reveal the Property Zones: IL+ #ynC
a.Right-click in the Design View and select View Preferences to display this O:`GL1{ve?
dialog box. ;S=62_ Un
b.On the Visibility tab, click the Property Zone check box to turn it on. Q oW ( tM
c.Click OK. #[k~RYS3
You will see the wire frame rendering of the spherical bumps on the J+/}K>2#
bottom surface, and a solid color above it. The solid color is the 3D texture 2p$n*|T&c
of the BEFs (brightness-enhancing films) built automatically by the utility.
