The default number of bumps is 100 (10 X 10). You need to change these Cp=DdmR
parameters to match your design. Note that LightTools allows many other zY_Bn J^
placement options, but you will use the Bezier placement option for this L nP={s
example. ~c~N _b
5.On both the X Placement tab and Y Placement tab, change the Number of f#}P>,TP
Bumps parameter to 300, as shown in the following figure. Click Apply after ,<s'/8Ik
each change. H4 p N+
6.Click OK to close the dialog box. ~6L\9B )
Note that the number of bumps is 300 X 300, which results in about 90,000 Q$Q s$
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a iV ;X``S
manner defined by the Bezier parameterization option. Please see Chapter 5 of {eA0I\c(C
the LightTools Core Module User’s Guide for more information. With the .<5 66g}VP
current parameter values, the Bezier option varies the bump spacing along the $K>'aI;|
length of the light guide. The spacing in the orthogonal direction is constant. Rl90uF]8
The X and Y refer to the local coordinate system of the surface. kbS+ 3#+
LightTools Introductory Tutorial * 91 Y5 e6|b|
U;p" x^U`
HAPTER 5 Introduction to Backlight Design B
3 <T#
C 0J7)UqMf.
Examining Surface Properties XM o#LS
Using the methods described in previous chapters, you may want to check your ':Y Fm
model before you run a simulation. I t>8XKS
Click on various parts of the model in the 3D Design View. Or use the System 0m k-o
Navigator to select different surfaces and view their Properties. ovJwo r
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 0V6gNEAUg
click Zones, and then click Texture. ]FV,}EZ
2.Select SphericalElement, and then right-click and select Properties from the Xr'Y[E [
shortcut menu. The Shape tab shows you a graphical representation of the F_0vh;Jo
spherical bump shape that is the bottom of the light guide. v&6I\1
You might be curious as to why you cannot see the 3D texture property zones you :MPWf4K2s
defined. They are invisible by default, because drawing thousands of texture +I1>;
{{
elements can make displaying and exploring the model somewhat slow. If you 0Snl_@s
choose to make them visible, 3D textures are displayed in wireframe, even if the Zd G?fWWA
display mode is set to translucent. Wireframe rendering displays a bit faster and 9NX f~-V-
shows more of the technical details. {"hX_t
92 * LightTools Introductory Tutorial Q${0(#Nu
1}nrVn[B9
HAPTER 5 Introduction to Backlight Design -DD2
C 46`(u"RP
1.Rotate and zoom the model to that you can see something like the illustration 9>,$q"M }?
below: ?/"Fwjau
. C3 >X1nU
2.To reveal the Property Zones: T= Q"| S]V
a.Right-click in the Design View and select View Preferences to display this &L6xagR7M
dialog box. %%`Q5I
b.On the Visibility tab, click the Property Zone check box to turn it on. p2T<nP<Pt
c.Click OK. ('k ;Ikut
You will see the wire frame rendering of the spherical bumps on the
/6)6
bottom surface, and a solid color above it. The solid color is the 3D texture =(\
/+
0-[
of the BEFs (brightness-enhancing films) built automatically by the utility.
