The default number of bumps is 100 (10 X 10). You need to change these
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parameters to match your design. Note that LightTools allows many other :~T99^$zA
placement options, but you will use the Bezier placement option for this j=aI 9p
example. 'JfdV%M
5.On both the X Placement tab and Y Placement tab, change the Number of 8UyMVY
Bumps parameter to 300, as shown in the following figure. Click Apply after IrhA+)pdse
each change. HxK80mJ
6.Click OK to close the dialog box. ~SF<,-Kg
Note that the number of bumps is 300 X 300, which results in about 90,000 HbA kZP
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a -w_QJ_ z_
manner defined by the Bezier parameterization option. Please see Chapter 5 of ime\f*Fg
the LightTools Core Module User’s Guide for more information. With the oxkoA
current parameter values, the Bezier option varies the bump spacing along the iIa'2+
length of the light guide. The spacing in the orthogonal direction is constant. \uC15s<
The X and Y refer to the local coordinate system of the surface. ^_u kLzP9
LightTools Introductory Tutorial * 91 2fR02={-
;y\IqiA{o
HAPTER 5 Introduction to Backlight Design bc) ~k:
C /.M N
Examining Surface Properties fM63+9I)\
Using the methods described in previous chapters, you may want to check your !&/{E
[
model before you run a simulation. Q[pV !C H
Click on various parts of the model in the 3D Design View. Or use the System /ZPyN <@
Navigator to select different surfaces and view their Properties. X+S9{X#Cm
1.In the System Navigator, click to open BottomSurface of the LightGuide, then EzV96+
click Zones, and then click Texture. db6b-Y{
2.Select SphericalElement, and then right-click and select Properties from the OJ$]V,Z00x
shortcut menu. The Shape tab shows you a graphical representation of the ]0)|7TV*
spherical bump shape that is the bottom of the light guide. t&CJ% XP
You might be curious as to why you cannot see the 3D texture property zones you af+IP_6
.
defined. They are invisible by default, because drawing thousands of texture qA $*YIlK
elements can make displaying and exploring the model somewhat slow. If you 0F|AA"mMT
choose to make them visible, 3D textures are displayed in wireframe, even if the 2.zsCu4lj.
display mode is set to translucent. Wireframe rendering displays a bit faster and MIoEauf
shows more of the technical details. s6zNV4
92 * LightTools Introductory Tutorial d%,eZXg'
;\Y& ce
HAPTER 5 Introduction to Backlight Design 7MHKeLq
C {( wHPzq
1.Rotate and zoom the model to that you can see something like the illustration "4H
+!r}
below: j|%HIF25
. <$~mE 9a6
2.To reveal the Property Zones: 5nO% Ke=
a.Right-click in the Design View and select View Preferences to display this M:3h e
dialog box. xJZ>uTN
b.On the Visibility tab, click the Property Zone check box to turn it on. wl$h4 {L7
c.Click OK. ?)X,0P'
You will see the wire frame rendering of the spherical bumps on the (egzH?
bottom surface, and a solid color above it. The solid color is the 3D texture M9@ri ^x
of the BEFs (brightness-enhancing films) built automatically by the utility.
