The default number of bumps is 100 (10 X 10). You need to change these >R/^|hnJ
parameters to match your design. Note that LightTools allows many other lY_ E=K]
placement options, but you will use the Bezier placement option for this 0fnd9`N!0
example. ~130"WQ;
5.On both the X Placement tab and Y Placement tab, change the Number of Tn[DF9;?
Bumps parameter to 300, as shown in the following figure. Click Apply after "])X0z yM
each change. u >H^bCXI
6.Click OK to close the dialog box. h\KQ{-Bl
Note that the number of bumps is 300 X 300, which results in about 90,000 'DlY8rEGP
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a +bvY*^i
manner defined by the Bezier parameterization option. Please see Chapter 5 of )Y @
the LightTools Core Module User’s Guide for more information. With the GVZ/`^ndM
current parameter values, the Bezier option varies the bump spacing along the in - /
length of the light guide. The spacing in the orthogonal direction is constant. G*e/Ft.wf8
The X and Y refer to the local coordinate system of the surface. o[^% 0uVF
LightTools Introductory Tutorial * 91 XU.ZYY Z=
3a9Oj'd1M
HAPTER 5 Introduction to Backlight Design lyKV^7}
C j& f-yc'i-
Examining Surface Properties zt!mx{l'
Using the methods described in previous chapters, you may want to check your +L*2 6ar6
model before you run a simulation. PdJtJqA8h\
Click on various parts of the model in the 3D Design View. Or use the System ,T_HE3 K
Navigator to select different surfaces and view their Properties. {<&I4V@+
1.In the System Navigator, click to open BottomSurface of the LightGuide, then wQ[~7 ,o
click Zones, and then click Texture. Z=DAA+T`
2.Select SphericalElement, and then right-click and select Properties from the 0R< @*
shortcut menu. The Shape tab shows you a graphical representation of the i NzoDmE*
spherical bump shape that is the bottom of the light guide. oddS~lW
You might be curious as to why you cannot see the 3D texture property zones you I(/W+ o
defined. They are invisible by default, because drawing thousands of texture 3> - /sii
elements can make displaying and exploring the model somewhat slow. If you qHg\n)R"x!
choose to make them visible, 3D textures are displayed in wireframe, even if the ?stx3sZ
display mode is set to translucent. Wireframe rendering displays a bit faster and * 4G J<
shows more of the technical details. X !,P] G
92 * LightTools Introductory Tutorial z?_c:]D
#\iQ`Q<B
HAPTER 5 Introduction to Backlight Design sN 1x|pkN
C BqK| 4-Pf
1.Rotate and zoom the model to that you can see something like the illustration K
4I ?1
below: Yt!UIl\<
. S1wt>}w0$
2.To reveal the Property Zones: /s
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a.Right-click in the Design View and select View Preferences to display this #
SV*6
dialog box. +b I &0`
b.On the Visibility tab, click the Property Zone check box to turn it on. =(K;z9O R
c.Click OK. H:4r6-{
You will see the wire frame rendering of the spherical bumps on the j" HB[N
bottom surface, and a solid color above it. The solid color is the 3D texture s#?Y^bgH
of the BEFs (brightness-enhancing films) built automatically by the utility.
