The default number of bumps is 100 (10 X 10). You need to change these `43`*=
parameters to match your design. Note that LightTools allows many other xbFoXYqgP
placement options, but you will use the Bezier placement option for this MjAF&bD^
example. {jX
h/`
5.On both the X Placement tab and Y Placement tab, change the Number of o!`.LL%
Bumps parameter to 300, as shown in the following figure. Click Apply after >g!a\=-[
each change. MOuI;EF
6.Click OK to close the dialog box. L {6y]t7^
Note that the number of bumps is 300 X 300, which results in about 90,000 _y q"F#,*
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ?-
5{XrNm
manner defined by the Bezier parameterization option. Please see Chapter 5 of sD,[,6(
the LightTools Core Module User’s Guide for more information. With the Ng?n}$g*
current parameter values, the Bezier option varies the bump spacing along the E-NuCP%|c
length of the light guide. The spacing in the orthogonal direction is constant. ;O*y$|+PA
The X and Y refer to the local coordinate system of the surface. %t&5o>1C
LightTools Introductory Tutorial * 91 p!MOp-;-
e~C^*w L
HAPTER 5 Introduction to Backlight Design Ds4n>V,o
C k# 8,:B2
Examining Surface Properties $6~D 2K
Using the methods described in previous chapters, you may want to check your ] VifDFL}
model before you run a simulation. ; ?>xuC$
Click on various parts of the model in the 3D Design View. Or use the System _7(>0GY
Navigator to select different surfaces and view their Properties. N 4$!V}pp
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Iz/o|o]#
click Zones, and then click Texture. iV!o)WvG,F
2.Select SphericalElement, and then right-click and select Properties from the G 2]/g
shortcut menu. The Shape tab shows you a graphical representation of the ~7Ey9wRkD
spherical bump shape that is the bottom of the light guide. %(GWR@mfC
You might be curious as to why you cannot see the 3D texture property zones you 3;(6tWWLT
defined. They are invisible by default, because drawing thousands of texture d`D<PT(\
elements can make displaying and exploring the model somewhat slow. If you 7q>WO
choose to make them visible, 3D textures are displayed in wireframe, even if the DBuvbq-
display mode is set to translucent. Wireframe rendering displays a bit faster and .0l 0*~[
shows more of the technical details. < KF|QE
92 * LightTools Introductory Tutorial 6b9 oS Y-8
g@!mV)c97
HAPTER 5 Introduction to Backlight Design LXr
yv;H
C e"u=4 nk
1.Rotate and zoom the model to that you can see something like the illustration *{t{/^'y
below: 8=rD'*
. 1$Rua
2.To reveal the Property Zones: UD|Qa
a.Right-click in the Design View and select View Preferences to display this 0FrmZ$
dialog box. _&TA|Da
b.On the Visibility tab, click the Property Zone check box to turn it on. o}&TFh T
c.Click OK.
NIcPjo
You will see the wire frame rendering of the spherical bumps on the {_0m0
8
bottom surface, and a solid color above it. The solid color is the 3D texture ^nu~q+:+#
of the BEFs (brightness-enhancing films) built automatically by the utility.
