The default number of bumps is 100 (10 X 10). You need to change these k<H%vg>{~s
parameters to match your design. Note that LightTools allows many other $B \ H
placement options, but you will use the Bezier placement option for this tJNIr5o
example. YutQ ]zYA.
5.On both the X Placement tab and Y Placement tab, change the Number of H$! +A
Bumps parameter to 300, as shown in the following figure. Click Apply after GF8 -_X
each change. J! { Al
6.Click OK to close the dialog box. ow$q7uf
Note that the number of bumps is 300 X 300, which results in about 90,000 \R(R9cry
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a *m9{V8Yi2
manner defined by the Bezier parameterization option. Please see Chapter 5 of En(7(qP6}
the LightTools Core Module User’s Guide for more information. With the g+xw$A ou
current parameter values, the Bezier option varies the bump spacing along the .wmnnvtl ,
length of the light guide. The spacing in the orthogonal direction is constant. K/txD20
O|
The X and Y refer to the local coordinate system of the surface. [ $pmPr2
LightTools Introductory Tutorial * 91 ciud RK63M
Rf)ke("
HAPTER 5 Introduction to Backlight Design ?c]n^GvG
C 5,1{Tv`
Examining Surface Properties _T5)n=|
Using the methods described in previous chapters, you may want to check your "xe=N
model before you run a simulation. Tk*w3c"$
Click on various parts of the model in the 3D Design View. Or use the System UZGDdP
Navigator to select different surfaces and view their Properties. .6 3=(o
1.In the System Navigator, click to open BottomSurface of the LightGuide, then !4WEk
click Zones, and then click Texture. r3qf[?3`6
2.Select SphericalElement, and then right-click and select Properties from the Gh}yb-$N`&
shortcut menu. The Shape tab shows you a graphical representation of the 0w %[
spherical bump shape that is the bottom of the light guide. UL(
lf}M
You might be curious as to why you cannot see the 3D texture property zones you Ye5jB 2Z
defined. They are invisible by default, because drawing thousands of texture g JjN<&,
elements can make displaying and exploring the model somewhat slow. If you */z??fI27
choose to make them visible, 3D textures are displayed in wireframe, even if the tu0aD%C
display mode is set to translucent. Wireframe rendering displays a bit faster and bUZ_UW
shows more of the technical details. 1D F/6y
92 * LightTools Introductory Tutorial d;7 uFh| o
]E3<UR
HAPTER 5 Introduction to Backlight Design Ow:1?Z{4
C BQ/PGY>
1.Rotate and zoom the model to that you can see something like the illustration 5|I55CTx
below: A(8n
. yHeEobvb
2.To reveal the Property Zones: C3XmK}h
a.Right-click in the Design View and select View Preferences to display this /6K Il
dialog box. Pf <[|yu4?
b.On the Visibility tab, click the Property Zone check box to turn it on. =8Ehrlq
c.Click OK. `y^sITr
You will see the wire frame rendering of the spherical bumps on the -r<#rITH"
bottom surface, and a solid color above it. The solid color is the 3D texture hePPxKQ-
of the BEFs (brightness-enhancing films) built automatically by the utility.
