The default number of bumps is 100 (10 X 10). You need to change these : .,I4>b2
parameters to match your design. Note that LightTools allows many other W +E2({
placement options, but you will use the Bezier placement option for this K0]Wb=v
example. BJ5#!I%h
5.On both the X Placement tab and Y Placement tab, change the Number of $B2@mC([S
Bumps parameter to 300, as shown in the following figure. Click Apply after mq L+W
each change. T$ e_ ao|
6.Click OK to close the dialog box. K2QD&!4/T2
Note that the number of bumps is 300 X 300, which results in about 90,000 .(-3L9T}
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 5tL6R3
manner defined by the Bezier parameterization option. Please see Chapter 5 of vKeK]
the LightTools Core Module User’s Guide for more information. With the C0M{ zGT>}
current parameter values, the Bezier option varies the bump spacing along the (hoqLL\}k
length of the light guide. The spacing in the orthogonal direction is constant. vh C"f*
The X and Y refer to the local coordinate system of the surface. BG"6 jQh
LightTools Introductory Tutorial * 91 `t
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Z6p>R;9n
HAPTER 5 Introduction to Backlight Design
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C Xqy{=:0
Examining Surface Properties Evc
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Using the methods described in previous chapters, you may want to check your {~SR>I3sv
model before you run a simulation. >7 |37a
Click on various parts of the model in the 3D Design View. Or use the System 62"ND+D4
Navigator to select different surfaces and view their Properties. OX"`VE
1.In the System Navigator, click to open BottomSurface of the LightGuide, then e#wn;wo?
click Zones, and then click Texture. xM:dFS
2.Select SphericalElement, and then right-click and select Properties from the RwE]t$T/
shortcut menu. The Shape tab shows you a graphical representation of the (:1 j-
spherical bump shape that is the bottom of the light guide. wa C%o%fD
You might be curious as to why you cannot see the 3D texture property zones you H4N==o
defined. They are invisible by default, because drawing thousands of texture PJLA^e C7>
elements can make displaying and exploring the model somewhat slow. If you 1gC=xMAT
choose to make them visible, 3D textures are displayed in wireframe, even if the V;! D:N8<
display mode is set to translucent. Wireframe rendering displays a bit faster and 2+enRR~
shows more of the technical details. &}]Wbk4:
92 * LightTools Introductory Tutorial R?W8l5CIk
;8@A7`^
HAPTER 5 Introduction to Backlight Design Ii)TCSt9U?
C =k'dbcfO$9
1.Rotate and zoom the model to that you can see something like the illustration (.c?)_G,
below: pr2d}~q4{
. 'B C- 'Ot
2.To reveal the Property Zones: *VH1(E`hl
a.Right-click in the Design View and select View Preferences to display this =<g\B?s]
dialog box. ()r DM@
b.On the Visibility tab, click the Property Zone check box to turn it on. mUjA9[@
c.Click OK. NS1[-n g
You will see the wire frame rendering of the spherical bumps on the U5k lVl
bottom surface, and a solid color above it. The solid color is the 3D texture \rpu=*gt
of the BEFs (brightness-enhancing films) built automatically by the utility.
