The default number of bumps is 100 (10 X 10). You need to change these qB+OxyT&
parameters to match your design. Note that LightTools allows many other =&PO_t5) z
placement options, but you will use the Bezier placement option for this SeuDJxqopD
example. 5"bg 8hL
5.On both the X Placement tab and Y Placement tab, change the Number of :;\xyy}A
Bumps parameter to 300, as shown in the following figure. Click Apply after 2fXwJG'
each change. y5 X FJj
6.Click OK to close the dialog box. BZIU@^Q_Y[
Note that the number of bumps is 300 X 300, which results in about 90,000 0^)~p{Zh
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a OW#G{#.6R
manner defined by the Bezier parameterization option. Please see Chapter 5 of _ Td#C1g3
the LightTools Core Module User’s Guide for more information. With the AC!yc(^<
current parameter values, the Bezier option varies the bump spacing along the goND S5 }
length of the light guide. The spacing in the orthogonal direction is constant. >8&fFq
The X and Y refer to the local coordinate system of the surface. >
w SI0N
LightTools Introductory Tutorial * 91 ilZQ/hOBH
&UO/p/a
HAPTER 5 Introduction to Backlight Design aGAr24]y
C ED);2*q P}
Examining Surface Properties 7jG fQ
Using the methods described in previous chapters, you may want to check your _Ud! tK *H
model before you run a simulation. ?1r<`o3l\
Click on various parts of the model in the 3D Design View. Or use the System ( X+2vN
Navigator to select different surfaces and view their Properties. M !X^2
1.In the System Navigator, click to open BottomSurface of the LightGuide, then OGO\u#
click Zones, and then click Texture. ?Ss ~!38
2.Select SphericalElement, and then right-click and select Properties from the B~b
='jN
shortcut menu. The Shape tab shows you a graphical representation of the i~)EU F
spherical bump shape that is the bottom of the light guide. 1$^r@rP
You might be curious as to why you cannot see the 3D texture property zones you uo(LZUjPbN
defined. They are invisible by default, because drawing thousands of texture rC_saHo>#R
elements can make displaying and exploring the model somewhat slow. If you jvpv1>KYV
choose to make them visible, 3D textures are displayed in wireframe, even if the KOoV'YSC[(
display mode is set to translucent. Wireframe rendering displays a bit faster and `i+2YCk
shows more of the technical details. A`"?~_pHC
92 * LightTools Introductory Tutorial f{u S
cucT | y
HAPTER 5 Introduction to Backlight Design 8L]Cc!~
C 4J?\JcGs
1.Rotate and zoom the model to that you can see something like the illustration -9Ygn_ M
below: # w8.aNU+]
. BK
wo2=m~
2.To reveal the Property Zones: ;= 1[D
a.Right-click in the Design View and select View Preferences to display this 0g; o6Fg
dialog box. e_g&L)
b.On the Visibility tab, click the Property Zone check box to turn it on. KTwP.!<v
c.Click OK. h"'}Z^
You will see the wire frame rendering of the spherical bumps on the ?mN!9/DIc
bottom surface, and a solid color above it. The solid color is the 3D texture 8k+k\V{
of the BEFs (brightness-enhancing films) built automatically by the utility.
