The default number of bumps is 100 (10 X 10). You need to change these $U*e q [
parameters to match your design. Note that LightTools allows many other VKl,m ;& N
placement options, but you will use the Bezier placement option for this ^AH[]sE_
example. 4HGT gS
5.On both the X Placement tab and Y Placement tab, change the Number of s{@R|5
Bumps parameter to 300, as shown in the following figure. Click Apply after 8{jXSCP#
each change. ;&&<zWq 3h
6.Click OK to close the dialog box. %`C*8fc&
Note that the number of bumps is 300 X 300, which results in about 90,000 UE'=9{o`
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a xT"V9t[f
manner defined by the Bezier parameterization option. Please see Chapter 5 of RG{T\9]n
the LightTools Core Module User’s Guide for more information. With the Yb U8 xq
current parameter values, the Bezier option varies the bump spacing along the (U.Go/A#wE
length of the light guide. The spacing in the orthogonal direction is constant. ?Z 2, ?G
The X and Y refer to the local coordinate system of the surface. QF x3N%
LightTools Introductory Tutorial * 91 =$J(]KPv!?
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U]<S?
HAPTER 5 Introduction to Backlight Design :|s8v2am
C D6Ad "|Z
Examining Surface Properties vW=-RTRH
Using the methods described in previous chapters, you may want to check your nZbI} kcm
model before you run a simulation. 8TFQ%jv
Click on various parts of the model in the 3D Design View. Or use the System euB 1}M
Navigator to select different surfaces and view their Properties. BuV71/Vb{Q
1.In the System Navigator, click to open BottomSurface of the LightGuide, then J
_O5^=BP
click Zones, and then click Texture. W^[FWF UTY
2.Select SphericalElement, and then right-click and select Properties from the 3 :x(2 A
shortcut menu. The Shape tab shows you a graphical representation of the Z6zV 9hn
spherical bump shape that is the bottom of the light guide. J =^IS\m
You might be curious as to why you cannot see the 3D texture property zones you Q]K` p(
defined. They are invisible by default, because drawing thousands of texture O6hzOyNX@
elements can make displaying and exploring the model somewhat slow. If you L(TM&
ps\-
choose to make them visible, 3D textures are displayed in wireframe, even if the :ZXd%
display mode is set to translucent. Wireframe rendering displays a bit faster and _p*9LsN$L
shows more of the technical details. v8ap"9b
92 * LightTools Introductory Tutorial F"] P|
o^@"eG$,
HAPTER 5 Introduction to Backlight Design T '5{p
C *&I>3;~%^}
1.Rotate and zoom the model to that you can see something like the illustration G]=z
