The default number of bumps is 100 (10 X 10). You need to change these 0[l}@ K ?
parameters to match your design. Note that LightTools allows many other Y7.+
Ma#|
placement options, but you will use the Bezier placement option for this A7Ql%$v7^
example. |@u2/U9
5.On both the X Placement tab and Y Placement tab, change the Number of ^A@f{g$KB+
Bumps parameter to 300, as shown in the following figure. Click Apply after /AD&z?My+E
each change. F<,pAxl~@
6.Click OK to close the dialog box. Xe %J{
Note that the number of bumps is 300 X 300, which results in about 90,000 bg i_QB#k\
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ?Fl}@EA#M
manner defined by the Bezier parameterization option. Please see Chapter 5 of &))d],tJX
the LightTools Core Module User’s Guide for more information. With the t2o{=!$WH
current parameter values, the Bezier option varies the bump spacing along the CW+kK N
length of the light guide. The spacing in the orthogonal direction is constant. 9 8|sWI3 B
The X and Y refer to the local coordinate system of the surface. X[o+Y@bc
LightTools Introductory Tutorial * 91 <R]m(
w 0_P9g:
HAPTER 5 Introduction to Backlight Design [7I b T:ph
C >J7slDRo
Examining Surface Properties }ssV"5M
Using the methods described in previous chapters, you may want to check your m[}k]PB>
model before you run a simulation. -i`jS_-Cv-
Click on various parts of the model in the 3D Design View. Or use the System _ p\L,No
Navigator to select different surfaces and view their Properties. ]eKuR"ob0
1.In the System Navigator, click to open BottomSurface of the LightGuide, then uCDe>Q4@/
click Zones, and then click Texture. ;d6Dm)/(
2.Select SphericalElement, and then right-click and select Properties from the P\j\p
=
shortcut menu. The Shape tab shows you a graphical representation of the XPX?+W=mv
spherical bump shape that is the bottom of the light guide. ['IH*gi
You might be curious as to why you cannot see the 3D texture property zones you 7
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defined. They are invisible by default, because drawing thousands of texture O`@Nl
elements can make displaying and exploring the model somewhat slow. If you ^aSb~l ce
choose to make them visible, 3D textures are displayed in wireframe, even if the YCbvCw$Ob
display mode is set to translucent. Wireframe rendering displays a bit faster and !q2zuxq!R
shows more of the technical details. B> fZH \Y
92 * LightTools Introductory Tutorial !zX() V
5skN'*oG
HAPTER 5 Introduction to Backlight Design G4@r_VP \
C }3{eVct#|
1.Rotate and zoom the model to that you can see something like the illustration {$^'oRk
below: Vgm'&YT
. SboHo({5VA
2.To reveal the Property Zones: 1C<cwd;9
a.Right-click in the Design View and select View Preferences to display this c<_%KL&R
dialog box. |{ N{VK
b.On the Visibility tab, click the Property Zone check box to turn it on. x(Bt[=,K3
c.Click OK. >5CK&6
You will see the wire frame rendering of the spherical bumps on the ,.<mj !YE
bottom surface, and a solid color above it. The solid color is the 3D texture ~!$"J}d}<
of the BEFs (brightness-enhancing films) built automatically by the utility.
