The default number of bumps is 100 (10 X 10). You need to change these r _{)?B
parameters to match your design. Note that LightTools allows many other <>ZB W9
placement options, but you will use the Bezier placement option for this !3O,DhH>MC
example. @2-Hj ~
5.On both the X Placement tab and Y Placement tab, change the Number of WV5r$
Bumps parameter to 300, as shown in the following figure. Click Apply after ez{P-qB
each change. LG" BfYy6
6.Click OK to close the dialog box. -6.i\
B
Note that the number of bumps is 300 X 300, which results in about 90,000 O7Y
P_<,#
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 6{Krw \0
manner defined by the Bezier parameterization option. Please see Chapter 5 of 3sd{A kD^
the LightTools Core Module User’s Guide for more information. With the h0'8NvalQ
current parameter values, the Bezier option varies the bump spacing along the 9;;]q?*
length of the light guide. The spacing in the orthogonal direction is constant. }[XB]Xf
The X and Y refer to the local coordinate system of the surface. W)G2Cs?p
LightTools Introductory Tutorial * 91 cij]&$;Q
+H2m<
HAPTER 5 Introduction to Backlight Design G.A=hGw
C r{; VTQ
Examining Surface Properties T%;k%
Using the methods described in previous chapters, you may want to check your Ngm O0H
model before you run a simulation. IG2 `9rR
Click on various parts of the model in the 3D Design View. Or use the System kMfc"JXF
Navigator to select different surfaces and view their Properties. :pL1F)-*
1.In the System Navigator, click to open BottomSurface of the LightGuide, then $9LGdKZ_D
click Zones, and then click Texture. 4eDmLC"Y
*
2.Select SphericalElement, and then right-click and select Properties from the j\i;'t}8g
shortcut menu. The Shape tab shows you a graphical representation of the ^VM"!O;h {
spherical bump shape that is the bottom of the light guide. >x|A7iWn{,
You might be curious as to why you cannot see the 3D texture property zones you HM(bR"E
defined. They are invisible by default, because drawing thousands of texture -+j9X;h:
elements can make displaying and exploring the model somewhat slow. If you tkm~KLWV&7
choose to make them visible, 3D textures are displayed in wireframe, even if the B` t6H
display mode is set to translucent. Wireframe rendering displays a bit faster and 'P mHBQvt&
shows more of the technical details. XZUB* P}]D
92 * LightTools Introductory Tutorial iMOPD}`IX
Y%n{`9=
HAPTER 5 Introduction to Backlight Design T_5*iwI
C 0{U ]STj
1.Rotate and zoom the model to that you can see something like the illustration df21t^0/
below: !.tL"U~4
. B J:E,P`_
2.To reveal the Property Zones: HlOA o:8'
a.Right-click in the Design View and select View Preferences to display this gavQb3EP
dialog box. x`j$9XN5
b.On the Visibility tab, click the Property Zone check box to turn it on. ".*a)
c.Click OK. EDP I*@>
You will see the wire frame rendering of the spherical bumps on the YKs^%GO+
bottom surface, and a solid color above it. The solid color is the 3D texture !"o1ve`{
of the BEFs (brightness-enhancing films) built automatically by the utility.
