The default number of bumps is 100 (10 X 10). You need to change these @ =,J6
parameters to match your design. Note that LightTools allows many other ~j 4=PT
placement options, but you will use the Bezier placement option for this ]':C~ -RV{
example. K {iay g!k
5.On both the X Placement tab and Y Placement tab, change the Number of tou^p-)GQ|
Bumps parameter to 300, as shown in the following figure. Click Apply after ut Tek5/
each change. TxiJ?sDh*
6.Click OK to close the dialog box. 2
43DdIG$
Note that the number of bumps is 300 X 300, which results in about 90,000 !*cf}<Kmw
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a \UC4ai2MK
manner defined by the Bezier parameterization option. Please see Chapter 5 of '*-SvA\Cx
the LightTools Core Module User’s Guide for more information. With the P9'5=e@jB
current parameter values, the Bezier option varies the bump spacing along the awawq9)Y
length of the light guide. The spacing in the orthogonal direction is constant. l9jcoVo .
The X and Y refer to the local coordinate system of the surface. Hv=coS>g:
LightTools Introductory Tutorial * 91
h!Q >h7
F-R`'{ ka
HAPTER 5 Introduction to Backlight Design ~q4y'dBy*
C ydFY<Mb(o
Examining Surface Properties rvG qUmSUs
Using the methods described in previous chapters, you may want to check your Xmnq ZWB
model before you run a simulation. "s* {0' jo
Click on various parts of the model in the 3D Design View. Or use the System q{@Wn] !k
Navigator to select different surfaces and view their Properties. Oh^X^*I$@
1.In the System Navigator, click to open BottomSurface of the LightGuide, then
[:k'VXL
click Zones, and then click Texture. t"L:3<U7
2.Select SphericalElement, and then right-click and select Properties from the lfKknp#B/O
shortcut menu. The Shape tab shows you a graphical representation of the *H$nydQ:
spherical bump shape that is the bottom of the light guide. /qCYNwWH9
You might be curious as to why you cannot see the 3D texture property zones you nJ? C 4\#3
defined. They are invisible by default, because drawing thousands of texture G]S E
A
elements can make displaying and exploring the model somewhat slow. If you PU >;4l
choose to make them visible, 3D textures are displayed in wireframe, even if the QZfPd\Q5
display mode is set to translucent. Wireframe rendering displays a bit faster and : vr,@1 c
shows more of the technical details. 2Re ulL8j
92 * LightTools Introductory Tutorial kj8zWG4KH
(r|T&'yK
HAPTER 5 Introduction to Backlight Design = MXF`k^}
C <V, ?!}V
1.Rotate and zoom the model to that you can see something like the illustration ufJFS+?
below: xvkof
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. }iC~B }
2.To reveal the Property Zones: 01 dx}L@hz
a.Right-click in the Design View and select View Preferences to display this y >OZ<!`
dialog box. Zu$f[U)X
b.On the Visibility tab, click the Property Zone check box to turn it on. Dux`BKl
c.Click OK. ]`NbNr]K
You will see the wire frame rendering of the spherical bumps on the Q\oUZnD$=
bottom surface, and a solid color above it. The solid color is the 3D texture _ (jE](,
of the BEFs (brightness-enhancing films) built automatically by the utility.
