The default number of bumps is 100 (10 X 10). You need to change these [Go p-Vi/~
parameters to match your design. Note that LightTools allows many other k \BJs@-
placement options, but you will use the Bezier placement option for this v/*}M&vo
example. 45. -P
5.On both the X Placement tab and Y Placement tab, change the Number of #%N v\ g;
Bumps parameter to 300, as shown in the following figure. Click Apply after `)%z k W
each change. e+6mbJ7y
6.Click OK to close the dialog box. V
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Note that the number of bumps is 300 X 300, which results in about 90,000 w=:o//~6j
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a WfpQ
manner defined by the Bezier parameterization option. Please see Chapter 5 of O42`Z9oK
the LightTools Core Module User’s Guide for more information. With the i)y8MlC{
current parameter values, the Bezier option varies the bump spacing along the |eyk b?j`
length of the light guide. The spacing in the orthogonal direction is constant. L#O1 >
The X and Y refer to the local coordinate system of the surface. waI?X2
LightTools Introductory Tutorial * 91 g%Bh-O9\
Wip@MGtJ
HAPTER 5 Introduction to Backlight Design ? lq
C B|pO2d e
Examining Surface Properties #(swVo:+E
Using the methods described in previous chapters, you may want to check your %jk7JDvl
model before you run a simulation. x1H1[0w,i
Click on various parts of the model in the 3D Design View. Or use the System 'yxN1JF
Navigator to select different surfaces and view their Properties. H3-(.l[!b)
1.In the System Navigator, click to open BottomSurface of the LightGuide, then B-^r0/y;
click Zones, and then click Texture. _D~l2M
2.Select SphericalElement, and then right-click and select Properties from the 9<n2-l|)
shortcut menu. The Shape tab shows you a graphical representation of the @<kY,ox@~
spherical bump shape that is the bottom of the light guide. TOapq9B]
You might be curious as to why you cannot see the 3D texture property zones you 5. ibH
defined. They are invisible by default, because drawing thousands of texture -Zq \x'
elements can make displaying and exploring the model somewhat slow. If you J,4,#2M8
choose to make them visible, 3D textures are displayed in wireframe, even if the =mR~\R(
I
display mode is set to translucent. Wireframe rendering displays a bit faster and +t*V7nW
shows more of the technical details. U\*]cw
92 * LightTools Introductory Tutorial `eZzYe(N
! Gob `# r
HAPTER 5 Introduction to Backlight Design DW(
/[jo\
C Gyx4}pV
1.Rotate and zoom the model to that you can see something like the illustration .3
>"qv
below: S[ch /
. (#kKL??W
2.To reveal the Property Zones: SR%k|YT
a.Right-click in the Design View and select View Preferences to display this V>Dqw!
dialog box. 6/Iq@BZ&
b.On the Visibility tab, click the Property Zone check box to turn it on. I3gl+)Q
c.Click OK. q QcQnd2K
You will see the wire frame rendering of the spherical bumps on the e"oTlB
bottom surface, and a solid color above it. The solid color is the 3D texture o|:c{pwq
of the BEFs (brightness-enhancing films) built automatically by the utility.
