The default number of bumps is 100 (10 X 10). You need to change these M_UmnqN1C
parameters to match your design. Note that LightTools allows many other YJHb\Cf.
placement options, but you will use the Bezier placement option for this $
-<(ge I
example. +x`p WH]2
5.On both the X Placement tab and Y Placement tab, change the Number of 1;c># 20
Bumps parameter to 300, as shown in the following figure. Click Apply after % JiF269
each change. s#aj5_G
6.Click OK to close the dialog box. p&Qm [!
Note that the number of bumps is 300 X 300, which results in about 90,000 |hi,]D^K c
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a J|^XD<Y
manner defined by the Bezier parameterization option. Please see Chapter 5 of %5zIh[!1 $
the LightTools Core Module User’s Guide for more information. With the sCY
current parameter values, the Bezier option varies the bump spacing along the }T\.;$f
length of the light guide. The spacing in the orthogonal direction is constant. 5vR])T/S0
The X and Y refer to the local coordinate system of the surface. cMT:Ij];
LightTools Introductory Tutorial * 91 :;hg :Q:
'Z.C&6_
HAPTER 5 Introduction to Backlight Design M \k[?i
C !lFNG:&`
Examining Surface Properties c -(dm:
Using the methods described in previous chapters, you may want to check your /0gr?I1wr7
model before you run a simulation. /%,aX [
Click on various parts of the model in the 3D Design View. Or use the System 0U*f"5F
Navigator to select different surfaces and view their Properties. 8N"WKBj|_d
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 9)S3{ i6w
click Zones, and then click Texture. "\}h
2.Select SphericalElement, and then right-click and select Properties from the R+K|K2"
shortcut menu. The Shape tab shows you a graphical representation of the yF6AI@y
spherical bump shape that is the bottom of the light guide. .5s58H cg,
You might be curious as to why you cannot see the 3D texture property zones you l1<=3+d
defined. They are invisible by default, because drawing thousands of texture Twd*HH
elements can make displaying and exploring the model somewhat slow. If you *My9r.F5o
choose to make them visible, 3D textures are displayed in wireframe, even if the t>N2K-8Qh
display mode is set to translucent. Wireframe rendering displays a bit faster and 2SlL`hN>Z
shows more of the technical details. J!~kqNI
92 * LightTools Introductory Tutorial 1QD4 9)
=X5w=(&
HAPTER 5 Introduction to Backlight Design LVdR,'lS
C H? z~V-8
1.Rotate and zoom the model to that you can see something like the illustration t}Td$K7
below: ']\SX*z?
. a cke q#
2.To reveal the Property Zones: Z}vDP^rf
a.Right-click in the Design View and select View Preferences to display this cU ? F D
dialog box. UNiK6h_%
b.On the Visibility tab, click the Property Zone check box to turn it on. j[\:#/J
c.Click OK. `w >D6K+
You will see the wire frame rendering of the spherical bumps on the H}G 9gi
bottom surface, and a solid color above it. The solid color is the 3D texture J;wBS w%1
of the BEFs (brightness-enhancing films) built automatically by the utility.
