The default number of bumps is 100 (10 X 10). You need to change these D4c}z#}*0
parameters to match your design. Note that LightTools allows many other VrQw;-rQ
placement options, but you will use the Bezier placement option for this ceH7Rq:4W
example. KG4~t=J`
5.On both the X Placement tab and Y Placement tab, change the Number of *NFy%ktu
Bumps parameter to 300, as shown in the following figure. Click Apply after tCI 8 \~
each change. 1k-^LdDj
6.Click OK to close the dialog box. AZI%KM[
Note that the number of bumps is 300 X 300, which results in about 90,000 ~.VWrHC
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 6:330"9
manner defined by the Bezier parameterization option. Please see Chapter 5 of f|m.v
+7k
the LightTools Core Module User’s Guide for more information. With the ZT"?W $
current parameter values, the Bezier option varies the bump spacing along the [\ @!~F{
length of the light guide. The spacing in the orthogonal direction is constant. RgRyo
The X and Y refer to the local coordinate system of the surface. 85w
D<bN27
LightTools Introductory Tutorial * 91 Mf%/t HK
(|(Y;%>-v
HAPTER 5 Introduction to Backlight Design YV . *8'*
C z]gxkol\
Examining Surface Properties
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Using the methods described in previous chapters, you may want to check your wZE[we^Q"
model before you run a simulation. 96}/;e]@
Click on various parts of the model in the 3D Design View. Or use the System ?9Fv0-g&n
Navigator to select different surfaces and view their Properties. qVZ=:D{
1.In the System Navigator, click to open BottomSurface of the LightGuide, then vTh-I& }:
click Zones, and then click Texture. sOz jViv
2.Select SphericalElement, and then right-click and select Properties from the '+f!(teLz
shortcut menu. The Shape tab shows you a graphical representation of the {|%5} \%
spherical bump shape that is the bottom of the light guide. >^+Q`"SN
You might be curious as to why you cannot see the 3D texture property zones you u vc0"g1h
defined. They are invisible by default, because drawing thousands of texture AY [7yPP
elements can make displaying and exploring the model somewhat slow. If you lY?TF
choose to make them visible, 3D textures are displayed in wireframe, even if the ;yBq'_e3
display mode is set to translucent. Wireframe rendering displays a bit faster and *q|.H9
K(
shows more of the technical details. 8ENAif
92 * LightTools Introductory Tutorial q>]v~
y{ !`4CxF
HAPTER 5 Introduction to Backlight Design E + JGqk
C w{I60|C]*
1.Rotate and zoom the model to that you can see something like the illustration 4JU#3
below: BL]!j#''KE
. L L9I:^
2.To reveal the Property Zones: riFE.;
a.Right-click in the Design View and select View Preferences to display this _^#PV}
dialog box. M}(4> W
b.On the Visibility tab, click the Property Zone check box to turn it on. h*_r='
E
c.Click OK. Y49kq}
You will see the wire frame rendering of the spherical bumps on the ""d3ownKhw
bottom surface, and a solid color above it. The solid color is the 3D texture \<i#Jn+ )
of the BEFs (brightness-enhancing films) built automatically by the utility.
