The default number of bumps is 100 (10 X 10). You need to change these 3YeG$^y"
parameters to match your design. Note that LightTools allows many other >] qc-{>&
placement options, but you will use the Bezier placement option for this qPW P &k
example. GX)u|g
5.On both the X Placement tab and Y Placement tab, change the Number of jk"`Z< j~
Bumps parameter to 300, as shown in the following figure. Click Apply after OtY `@\hy
each change. xVf| G_5$
6.Click OK to close the dialog box. dah[:rP,n{
Note that the number of bumps is 300 X 300, which results in about 90,000 GSY(
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Kh"?%ZIa
manner defined by the Bezier parameterization option. Please see Chapter 5 of QgrpBG
the LightTools Core Module User’s Guide for more information. With the T!-\@PB !
current parameter values, the Bezier option varies the bump spacing along the
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length of the light guide. The spacing in the orthogonal direction is constant. Qw z}B
The X and Y refer to the local coordinate system of the surface. ~< P
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LightTools Introductory Tutorial * 91
bo<~jb{
wJg1Y0 nh
HAPTER 5 Introduction to Backlight Design R]Vt Y7}i,
C W KQ^NEqr3
Examining Surface Properties !5wIIS:FT
Using the methods described in previous chapters, you may want to check your 1 ;d$#j
model before you run a simulation. B 5g j_ ^
Click on various parts of the model in the 3D Design View. Or use the System S_iMVHe
Navigator to select different surfaces and view their Properties. 2{M^,=^ >
1.In the System Navigator, click to open BottomSurface of the LightGuide, then PvR 6
z0
click Zones, and then click Texture. 7wWFr
2.Select SphericalElement, and then right-click and select Properties from the 7@C<oy_bb
shortcut menu. The Shape tab shows you a graphical representation of the /;{P}-H`ei
spherical bump shape that is the bottom of the light guide. ?42<J %p
You might be curious as to why you cannot see the 3D texture property zones you yxonRV$&
defined. They are invisible by default, because drawing thousands of texture +QB"8-
elements can make displaying and exploring the model somewhat slow. If you +~St !QV%
choose to make them visible, 3D textures are displayed in wireframe, even if the 6T>mW#E&
display mode is set to translucent. Wireframe rendering displays a bit faster and B*qi_{Gp
shows more of the technical details. pb^i^tA+A
92 * LightTools Introductory Tutorial 2^XGGB0
Z<U6<{b
HAPTER 5 Introduction to Backlight Design OHv[#xGuV?
C `{4i)n%e&
1.Rotate and zoom the model to that you can see something like the illustration FRcy`)
below: K*\' .~[6
. yhlFFbU
2.To reveal the Property Zones: Gk967pC
a.Right-click in the Design View and select View Preferences to display this %/EVUN9=
dialog box. R FKtr
b.On the Visibility tab, click the Property Zone check box to turn it on. 9K /HO!z
c.Click OK. zFfoqb#*g
You will see the wire frame rendering of the spherical bumps on the agkA}O
bottom surface, and a solid color above it. The solid color is the 3D texture yH7F ''O7
of the BEFs (brightness-enhancing films) built automatically by the utility.
