The default number of bumps is 100 (10 X 10). You need to change these IX$ $pdQ
parameters to match your design. Note that LightTools allows many other qHklu2_%
placement options, but you will use the Bezier placement option for this // g~1(
example. Q@nxGm
5.On both the X Placement tab and Y Placement tab, change the Number of g?)9zJ9
Bumps parameter to 300, as shown in the following figure. Click Apply after v:eVK!O
each change. xrp%b1Sy
6.Click OK to close the dialog box. ! p458~|
Note that the number of bumps is 300 X 300, which results in about 90,000 [T.kwQf4$
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a +!CG'qyN>
manner defined by the Bezier parameterization option. Please see Chapter 5 of c=h{^! [$
the LightTools Core Module User’s Guide for more information. With the "4zT P!Ow
current parameter values, the Bezier option varies the bump spacing along the nTyK Z(#u
length of the light guide. The spacing in the orthogonal direction is constant.
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The X and Y refer to the local coordinate system of the surface. ',v
-&1R
LightTools Introductory Tutorial * 91 5'Y @c
ZF>zzi+@
HAPTER 5 Introduction to Backlight Design YOy/'Le^:
C hVd%
jU:
Examining Surface Properties Yc&yv
Using the methods described in previous chapters, you may want to check your KYZ/b8C
model before you run a simulation. kO+Y5z6=
Click on various parts of the model in the 3D Design View. Or use the System \GEFhM4)
Navigator to select different surfaces and view their Properties. ^g"G1,[%w
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 4,`Yx s)%
click Zones, and then click Texture. ?v \A &d
2.Select SphericalElement, and then right-click and select Properties from the S)T~vK(n
shortcut menu. The Shape tab shows you a graphical representation of the lo5,E(7~h
spherical bump shape that is the bottom of the light guide. q{nN WvL
You might be curious as to why you cannot see the 3D texture property zones you C5c@@ch :
defined. They are invisible by default, because drawing thousands of texture sFsp `kf
elements can make displaying and exploring the model somewhat slow. If you \GO^2&g (
choose to make them visible, 3D textures are displayed in wireframe, even if the VE`5bD+%e
display mode is set to translucent. Wireframe rendering displays a bit faster and 7o-umZ}8
shows more of the technical details. YAYPof~A$l
92 * LightTools Introductory Tutorial R%=u<O
7jQ Owzj
HAPTER 5 Introduction to Backlight Design ]6bh #N;.
C !?,7Cu.5#6
1.Rotate and zoom the model to that you can see something like the illustration ZEYT17g]
below: HZX(kYV
. Z%E;*R2+:>
2.To reveal the Property Zones: 8M <q-sn4B
a.Right-click in the Design View and select View Preferences to display this omevF>b;
dialog box. N =FX3 Z
b.On the Visibility tab, click the Property Zone check box to turn it on. ~oWCTj-
c.Click OK. 0JN>w^
You will see the wire frame rendering of the spherical bumps on the JR] /\(
bottom surface, and a solid color above it. The solid color is the 3D texture 1qp<Fz[
of the BEFs (brightness-enhancing films) built automatically by the utility.
