The default number of bumps is 100 (10 X 10). You need to change these #y8Esik
parameters to match your design. Note that LightTools allows many other D}rnp wp{
placement options, but you will use the Bezier placement option for this 8/@*6J
example.
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5.On both the X Placement tab and Y Placement tab, change the Number of TB_OFbI2
Bumps parameter to 300, as shown in the following figure. Click Apply after x<5;#
each change. 7O~hA *Z
6.Click OK to close the dialog box. _D{{C
Note that the number of bumps is 300 X 300, which results in about 90,000 4}t$Lf_
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a &hE k m
manner defined by the Bezier parameterization option. Please see Chapter 5 of h
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the LightTools Core Module User’s Guide for more information. With the [+!~RV_
current parameter values, the Bezier option varies the bump spacing along the S]ed96V v
length of the light guide. The spacing in the orthogonal direction is constant. RgD:"zeM
The X and Y refer to the local coordinate system of the surface. 3F9 dr@I.7
LightTools Introductory Tutorial * 91 WeIi{<u8R
sWq@E6,I
HAPTER 5 Introduction to Backlight Design 7g4IAs oD
C NftR2
Examining Surface Properties K8uqLSP '
Using the methods described in previous chapters, you may want to check your 0pBG^I`_
model before you run a simulation. bwK1XlfD.s
Click on various parts of the model in the 3D Design View. Or use the System CpU
y~
Navigator to select different surfaces and view their Properties. c3 )6{
1.In the System Navigator, click to open BottomSurface of the LightGuide, then nFjaV`6`@
click Zones, and then click Texture. q4niA
2.Select SphericalElement, and then right-click and select Properties from the {
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shortcut menu. The Shape tab shows you a graphical representation of the 2E.D0E Cu
spherical bump shape that is the bottom of the light guide. +vYV x<uTQ
You might be curious as to why you cannot see the 3D texture property zones you @Ll^z e&HI
defined. They are invisible by default, because drawing thousands of texture s,j=Kym %
elements can make displaying and exploring the model somewhat slow. If you g{Hb3id9
choose to make them visible, 3D textures are displayed in wireframe, even if the zC rM~
display mode is set to translucent. Wireframe rendering displays a bit faster and ~Efi|A /
shows more of the technical details. q+)s
92 * LightTools Introductory Tutorial 36d6 KS 7
Bam 4%G5
HAPTER 5 Introduction to Backlight Design BAy)P1
C ~,{nBp9*
1.Rotate and zoom the model to that you can see something like the illustration 8* sP
below: )5 x,-m@
. r#c+{yY
2.To reveal the Property Zones: 85{@&T
a.Right-click in the Design View and select View Preferences to display this bKQ-PM&I/t
dialog box. H,)2 Ou-Wn
b.On the Visibility tab, click the Property Zone check box to turn it on. N#^o,/
c.Click OK. Lmc"q FzK
You will see the wire frame rendering of the spherical bumps on the cN7|Zs c\
bottom surface, and a solid color above it. The solid color is the 3D texture 6z5?9I4[
of the BEFs (brightness-enhancing films) built automatically by the utility.
