The default number of bumps is 100 (10 X 10). You need to change these /T 2 v`Li
parameters to match your design. Note that LightTools allows many other op 3a*KG
placement options, but you will use the Bezier placement option for this nELY( z
example. >
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5.On both the X Placement tab and Y Placement tab, change the Number of AmJdZs|/
Bumps parameter to 300, as shown in the following figure. Click Apply after ?5F;4 oR2g
each change. "whs?^/
6.Click OK to close the dialog box. R
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Note that the number of bumps is 300 X 300, which results in about 90,000 Hs6Kki1
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a g ;X K3R
manner defined by the Bezier parameterization option. Please see Chapter 5 of ?)Je%H
the LightTools Core Module User’s Guide for more information. With the +pQ3bX
current parameter values, the Bezier option varies the bump spacing along the {XV 'C @B
length of the light guide. The spacing in the orthogonal direction is constant. %'VzN3Q5V
The X and Y refer to the local coordinate system of the surface. (EH}lh }%
LightTools Introductory Tutorial * 91 3QF[@8EH{
S+*>""=
HAPTER 5 Introduction to Backlight Design -Ir>pY\!
C RL
H!f1cta
Examining Surface Properties iiWpm E<,
Using the methods described in previous chapters, you may want to check your UID `3X
model before you run a simulation. xrI9t?QaCb
Click on various parts of the model in the 3D Design View. Or use the System ca5;Z@t$S
Navigator to select different surfaces and view their Properties. tKds|0,j|
1.In the System Navigator, click to open BottomSurface of the LightGuide, then qyh]v [
click Zones, and then click Texture. FF0 ~i+5
2.Select SphericalElement, and then right-click and select Properties from the |:,`dQfw
shortcut menu. The Shape tab shows you a graphical representation of the =5:S"WNj
spherical bump shape that is the bottom of the light guide. Z~[eG"6zI
You might be curious as to why you cannot see the 3D texture property zones you .v-2A );I
defined. They are invisible by default, because drawing thousands of texture /1 uGsE+[
elements can make displaying and exploring the model somewhat slow. If you &VcO,7 A|
choose to make them visible, 3D textures are displayed in wireframe, even if the EVE"F'Ww,_
display mode is set to translucent. Wireframe rendering displays a bit faster and :Ys
;)W+R
shows more of the technical details. 4N=
g l(
92 * LightTools Introductory Tutorial \rE ] V,,2
cob??|,\m
HAPTER 5 Introduction to Backlight Design kq([c r
C :^`WrcOJ
1.Rotate and zoom the model to that you can see something like the illustration #K iqV6E
below: +;=>&XR0m
. 1&vR7z]*
2.To reveal the Property Zones: mx#)iHY
a.Right-click in the Design View and select View Preferences to display this j?g#8L;W\w
dialog box. T_# 8i^;D
b.On the Visibility tab, click the Property Zone check box to turn it on. \j &&o
c.Click OK. x(p/9$.#
You will see the wire frame rendering of the spherical bumps on the G:` So
bottom surface, and a solid color above it. The solid color is the 3D texture P>^$ X
of the BEFs (brightness-enhancing films) built automatically by the utility.
