The default number of bumps is 100 (10 X 10). You need to change these C;M.dd
parameters to match your design. Note that LightTools allows many other q*,];j/>k
placement options, but you will use the Bezier placement option for this ) 9,9yd~SI
example. 2vT>hC?oHz
5.On both the X Placement tab and Y Placement tab, change the Number of nUD)G<v
Bumps parameter to 300, as shown in the following figure. Click Apply after ?u"MsnCXYn
each change. A2!7a}*1(
6.Click OK to close the dialog box. ._Wm%'uX
Note that the number of bumps is 300 X 300, which results in about 90,000 rX dI`l#
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a D^$Nn *i;U
manner defined by the Bezier parameterization option. Please see Chapter 5 of k/l s!e?
the LightTools Core Module User’s Guide for more information. With the 9U^jsb<St>
current parameter values, the Bezier option varies the bump spacing along the + v{<<
length of the light guide. The spacing in the orthogonal direction is constant. d# T~xGqz
The X and Y refer to the local coordinate system of the surface. +eg$Z]Lht
LightTools Introductory Tutorial * 91 |]w0ytL>(2
]^uO 3!+
HAPTER 5 Introduction to Backlight Design Zqc+PO3lw
C @.6l^"L
Examining Surface Properties K \v1o
Using the methods described in previous chapters, you may want to check your h/W@R_Y
model before you run a simulation. 3@f@4t@5V
Click on various parts of the model in the 3D Design View. Or use the System " JzQCY^C
Navigator to select different surfaces and view their Properties.
QK)"-y}"g
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ,IX:u1mO
click Zones, and then click Texture. -}_- #L!Q
2.Select SphericalElement, and then right-click and select Properties from the n$i}r\
so
shortcut menu. The Shape tab shows you a graphical representation of the WLqwntzk
spherical bump shape that is the bottom of the light guide. Q&S\?cKe
You might be curious as to why you cannot see the 3D texture property zones you EW7heIT$
defined. They are invisible by default, because drawing thousands of texture BuII|j
elements can make displaying and exploring the model somewhat slow. If you 7vax[,a I
choose to make them visible, 3D textures are displayed in wireframe, even if the Lwm2:_\_b
display mode is set to translucent. Wireframe rendering displays a bit faster and v0&E!4q*'
shows more of the technical details. ]U.1 z
92 * LightTools Introductory Tutorial dP}=cZ~
9 &a&O
Z{
HAPTER 5 Introduction to Backlight Design \ W K ly
C ?4vf 2n@
1.Rotate and zoom the model to that you can see something like the illustration {U/a h2*
below: s=9 gp$9m
. Ad !=
*n
2.To reveal the Property Zones: uH 1%diL^
a.Right-click in the Design View and select View Preferences to display this GAG=4 g
dialog box. # -?C{$2I
b.On the Visibility tab, click the Property Zone check box to turn it on. -? {bCq
c.Click OK. Jv(9w[
You will see the wire frame rendering of the spherical bumps on the _' K J:3e
bottom surface, and a solid color above it. The solid color is the 3D texture F/GfEMSE
of the BEFs (brightness-enhancing films) built automatically by the utility.
