The default number of bumps is 100 (10 X 10). You need to change these } Tz<f d/
parameters to match your design. Note that LightTools allows many other TilCP"(6D
placement options, but you will use the Bezier placement option for this , |lDR@
example. tSf$`4
5.On both the X Placement tab and Y Placement tab, change the Number of %={[ e`,
Bumps parameter to 300, as shown in the following figure. Click Apply after W)z@>4`Bb
each change. _t7}ny[
6.Click OK to close the dialog box. )&F] j
Note that the number of bumps is 300 X 300, which results in about 90,000 v\}s(X(J
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 6M^NZ0 ~J
manner defined by the Bezier parameterization option. Please see Chapter 5 of wnr<# =,I'
the LightTools Core Module User’s Guide for more information. With the 0Uf.a P
current parameter values, the Bezier option varies the bump spacing along the hziPHuK9,
length of the light guide. The spacing in the orthogonal direction is constant. $eU oFa5A
The X and Y refer to the local coordinate system of the surface. O}Mu_edM
LightTools Introductory Tutorial * 91 ,CED%
=Y ]'wb
HAPTER 5 Introduction to Backlight Design ;RUod .x
C WV?3DzeR
Examining Surface Properties sn.0`Stt
Using the methods described in previous chapters, you may want to check your R[vA%G
model before you run a simulation. C>=[fAr mO
Click on various parts of the model in the 3D Design View. Or use the System ?"Ec#,~
Navigator to select different surfaces and view their Properties. $O[$<D%H
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ur @"wcl"V
click Zones, and then click Texture. PO@b9O
2.Select SphericalElement, and then right-click and select Properties from the P
?A:0a
shortcut menu. The Shape tab shows you a graphical representation of the : pkOZ+t
spherical bump shape that is the bottom of the light guide. 4 >`2vb
You might be curious as to why you cannot see the 3D texture property zones you u_ *DS-
defined. They are invisible by default, because drawing thousands of texture Vm]xV_FOd
elements can make displaying and exploring the model somewhat slow. If you j#rj_ uP
choose to make them visible, 3D textures are displayed in wireframe, even if the 9=5xt;mEs}
display mode is set to translucent. Wireframe rendering displays a bit faster and (ptk!u6
shows more of the technical details. *u ^m f~
92 * LightTools Introductory Tutorial k" $E|$
bD:[r))#e
HAPTER 5 Introduction to Backlight Design +zL|j/q ?
C 3` +Bq+
1.Rotate and zoom the model to that you can see something like the illustration O-,0c1ts
below: \C &V)/
. Cw$7d:u
2.To reveal the Property Zones: u5O`|I@R
a.Right-click in the Design View and select View Preferences to display this f =T-4Of
dialog box. h#~\-j 9 >
b.On the Visibility tab, click the Property Zone check box to turn it on. rInZd`\
c.Click OK. yR$ld.[uf
You will see the wire frame rendering of the spherical bumps on the z~($
"
bottom surface, and a solid color above it. The solid color is the 3D texture w^Atd|~gi
of the BEFs (brightness-enhancing films) built automatically by the utility.
