The default number of bumps is 100 (10 X 10). You need to change these 6@?aVM~
parameters to match your design. Note that LightTools allows many other z
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placement options, but you will use the Bezier placement option for this oEQ{m5O9
example. KM/U?`6>:
5.On both the X Placement tab and Y Placement tab, change the Number of &}nBenYp
Bumps parameter to 300, as shown in the following figure. Click Apply after xBL$]>
each change. Tf#2"(!
6.Click OK to close the dialog box. H}sS4[z
Note that the number of bumps is 300 X 300, which results in about 90,000 c/<Sa|'
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a bB:r]*_
s]
manner defined by the Bezier parameterization option. Please see Chapter 5 of -W lp=#9
the LightTools Core Module User’s Guide for more information. With the crJ7 pe9
current parameter values, the Bezier option varies the bump spacing along the #*Yi4Cn<
length of the light guide. The spacing in the orthogonal direction is constant. Xq ,UV
The X and Y refer to the local coordinate system of the surface. M[YTk=IM#
LightTools Introductory Tutorial * 91 JO2ZS6k[
=f4[=C$&`
HAPTER 5 Introduction to Backlight Design
':4}O#
C r=~ WMDCz@
Examining Surface Properties la\zaKC;>
Using the methods described in previous chapters, you may want to check your %@lV-(5q
model before you run a simulation. MX!u$ei
Click on various parts of the model in the 3D Design View. Or use the System ;-K A UgL2
Navigator to select different surfaces and view their Properties. G$;]
?g
1.In the System Navigator, click to open BottomSurface of the LightGuide, then L$+d.=]
click Zones, and then click Texture. }W:*aU
2.Select SphericalElement, and then right-click and select Properties from the jl.okWuiY
shortcut menu. The Shape tab shows you a graphical representation of the .D8~)ZWN
spherical bump shape that is the bottom of the light guide. W.,% 0cZ
You might be curious as to why you cannot see the 3D texture property zones you 1B)Y;hg6&
defined. They are invisible by default, because drawing thousands of texture H96BqNoO
elements can make displaying and exploring the model somewhat slow. If you YgE]d?_h
choose to make them visible, 3D textures are displayed in wireframe, even if the M}Nb|V09
display mode is set to translucent. Wireframe rendering displays a bit faster and <w0NPrS]
shows more of the technical details. 2;r]g T~
92 * LightTools Introductory Tutorial 1Pk mg%+
4S, . R
HAPTER 5 Introduction to Backlight Design r] A" Og_U
C 1~}m.ER
1.Rotate and zoom the model to that you can see something like the illustration (jU/Wj!q
below: x9 &-(kBU
. '[Mlmgc5
2.To reveal the Property Zones: :s'o~
a.Right-click in the Design View and select View Preferences to display this xGYSi5}z
dialog box. ZCy`2Fir
b.On the Visibility tab, click the Property Zone check box to turn it on. &w +; N5}3
c.Click OK. -1qZqU$h
You will see the wire frame rendering of the spherical bumps on the fCgBH~w,9
bottom surface, and a solid color above it. The solid color is the 3D texture ry.;u*F
of the BEFs (brightness-enhancing films) built automatically by the utility.
