The default number of bumps is 100 (10 X 10). You need to change these G;e}z&6<k
parameters to match your design. Note that LightTools allows many other yFSL7`p+
placement options, but you will use the Bezier placement option for this KjadX&JD
example. 6{M.S}.^
5.On both the X Placement tab and Y Placement tab, change the Number of B !XT:.+
Bumps parameter to 300, as shown in the following figure. Click Apply after XL:7$
each change. !duR7a
6.Click OK to close the dialog box. ydt1ED0Q-
Note that the number of bumps is 300 X 300, which results in about 90,000 +~ -|(
y
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a d1-QkW^0y
manner defined by the Bezier parameterization option. Please see Chapter 5 of P1t5-q
the LightTools Core Module User’s Guide for more information. With the r$KDNa$/a
current parameter values, the Bezier option varies the bump spacing along the /SiQw7yp%
length of the light guide. The spacing in the orthogonal direction is constant. yC[}gHv
The X and Y refer to the local coordinate system of the surface. gnQd#`
LightTools Introductory Tutorial * 91 9g7T~|P
Dg@6o
HAPTER 5 Introduction to Backlight Design /=N`P &R#
C 'Gk|&^
Examining Surface Properties 7$ 'j a
Using the methods described in previous chapters, you may want to check your @bZb#,n]
model before you run a simulation. &\LbajP:+
Click on various parts of the model in the 3D Design View. Or use the System d^7<l_u~ !
Navigator to select different surfaces and view their Properties. }sFHb[I &
1.In the System Navigator, click to open BottomSurface of the LightGuide, then R$q:Ct
click Zones, and then click Texture. %\A~w3 E
2.Select SphericalElement, and then right-click and select Properties from the i[B%:q:&
shortcut menu. The Shape tab shows you a graphical representation of the M-n +3E9
spherical bump shape that is the bottom of the light guide. D 3]_AS&\
You might be curious as to why you cannot see the 3D texture property zones you ' G&w[8mqY
defined. They are invisible by default, because drawing thousands of texture d$ !ibL#o
elements can make displaying and exploring the model somewhat slow. If you YJ6Xq||_
choose to make them visible, 3D textures are displayed in wireframe, even if the v"j7},P@
display mode is set to translucent. Wireframe rendering displays a bit faster and EB \ \
F
shows more of the technical details. Af;$}P
92 * LightTools Introductory Tutorial 7j ^,4;
^Kn}{m/3Y
HAPTER 5 Introduction to Backlight Design o.,hCg)X
C JH 8^ZP:d'
1.Rotate and zoom the model to that you can see something like the illustration },l3N K
below: B wR)--75
. oZQu&O'
2.To reveal the Property Zones: Lr`yl$6
a.Right-click in the Design View and select View Preferences to display this \n} cx~j
dialog box. Qk((H~I}
b.On the Visibility tab, click the Property Zone check box to turn it on. N)QW $iw9
c.Click OK. >6c{CY uT
You will see the wire frame rendering of the spherical bumps on the MZ0 J/@(
bottom surface, and a solid color above it. The solid color is the 3D texture \Q]7H w<
of the BEFs (brightness-enhancing films) built automatically by the utility.
