The default number of bumps is 100 (10 X 10). You need to change these \S_ o{0ZY}
parameters to match your design. Note that LightTools allows many other t" $#KP<
placement options, but you will use the Bezier placement option for this o)L)|
example. ? APCDZ^
5.On both the X Placement tab and Y Placement tab, change the Number of Mp3nR5@d$
Bumps parameter to 300, as shown in the following figure. Click Apply after 0sP*ChY5S
each change. " Ng%"Nz
6.Click OK to close the dialog box. grxlGS~Q
Note that the number of bumps is 300 X 300, which results in about 90,000 D & Bdl5g
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 8U)*kmq
manner defined by the Bezier parameterization option. Please see Chapter 5 of x+bC\,q
the LightTools Core Module User’s Guide for more information. With the mVd%sWD
current parameter values, the Bezier option varies the bump spacing along the NX&Z=ObHu}
length of the light guide. The spacing in the orthogonal direction is constant. {+^&7JX
The X and Y refer to the local coordinate system of the surface. `]I p`_{
LightTools Introductory Tutorial * 91 7P bwCRg
(:>Sh0.
HAPTER 5 Introduction to Backlight Design !Bj J5m
C xyrlR;Sk
Examining Surface Properties <u}[_
Using the methods described in previous chapters, you may want to check your n[gc`#7|{e
model before you run a simulation. IMSLHwZ
Click on various parts of the model in the 3D Design View. Or use the System 0i>>CvAl}
Navigator to select different surfaces and view their Properties. Q"s]<MtdS
1.In the System Navigator, click to open BottomSurface of the LightGuide, then cB 6LJ}R
click Zones, and then click Texture. Gm[XnUR7V
2.Select SphericalElement, and then right-click and select Properties from the BC)1FxsGf
shortcut menu. The Shape tab shows you a graphical representation of the IP!`;?T=
spherical bump shape that is the bottom of the light guide. aeE~ [m
You might be curious as to why you cannot see the 3D texture property zones you Pyp#'du>
defined. They are invisible by default, because drawing thousands of texture >ra)4huZ
elements can make displaying and exploring the model somewhat slow. If you Aj*|r
choose to make them visible, 3D textures are displayed in wireframe, even if the gn:&akg
display mode is set to translucent. Wireframe rendering displays a bit faster and 8^pu C
shows more of the technical details. E/hO0Ox6
92 * LightTools Introductory Tutorial !8*7 {7
C ~Doj
HAPTER 5 Introduction to Backlight Design b"y4-KV
C e3k58
1.Rotate and zoom the model to that you can see something like the illustration &<EixDi4q
below: 1oI2
. : j`4nXm
2.To reveal the Property Zones: |~B` [p]5H
a.Right-click in the Design View and select View Preferences to display this -#Jp@6'k%
dialog box. I`nC\%g
b.On the Visibility tab, click the Property Zone check box to turn it on. W.l#@p
c.Click OK. E/2_@&U:}
You will see the wire frame rendering of the spherical bumps on the a(AY Y<g
bottom surface, and a solid color above it. The solid color is the 3D texture ^|(VI0KO
of the BEFs (brightness-enhancing films) built automatically by the utility.
