The default number of bumps is 100 (10 X 10). You need to change these DJvm wFx
parameters to match your design. Note that LightTools allows many other mN?y\GB
placement options, but you will use the Bezier placement option for this uT:'Kk b!
example. n]^zIe^6
5.On both the X Placement tab and Y Placement tab, change the Number of SEa'>UG
Bumps parameter to 300, as shown in the following figure. Click Apply after Fcz7
each change. 7yM=$"'d
6.Click OK to close the dialog box. oJb${ k<3
Note that the number of bumps is 300 X 300, which results in about 90,000 \9j +ejGf
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a d$qivct
manner defined by the Bezier parameterization option. Please see Chapter 5 of =j XBF.
the LightTools Core Module User’s Guide for more information. With the 4zyN>f|
current parameter values, the Bezier option varies the bump spacing along the yNCd}
4Ym5
length of the light guide. The spacing in the orthogonal direction is constant. R8|H*5T?+
The X and Y refer to the local coordinate system of the surface. wV8_O )[
LightTools Introductory Tutorial * 91 SO @d\H
(iQ<
[3C=
HAPTER 5 Introduction to Backlight Design x7\b-EC
C q F'lh
Examining Surface Properties 3/_rbPr
Using the methods described in previous chapters, you may want to check your Q*4{2oQ
model before you run a simulation. +~xY}
Click on various parts of the model in the 3D Design View. Or use the System gySCK-(y
Navigator to select different surfaces and view their Properties. T_iX1blrgh
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Buc{dcL/
click Zones, and then click Texture. <O:}dXqZ
2.Select SphericalElement, and then right-click and select Properties from the 1eHU!{<fqm
shortcut menu. The Shape tab shows you a graphical representation of the s kr dL.5
spherical bump shape that is the bottom of the light guide. S$#"bK/ p^
You might be curious as to why you cannot see the 3D texture property zones you y 5/frJ
defined. They are invisible by default, because drawing thousands of texture AXnRA W
elements can make displaying and exploring the model somewhat slow. If you X83,f CCl5
choose to make them visible, 3D textures are displayed in wireframe, even if the Uh[MB w K
display mode is set to translucent. Wireframe rendering displays a bit faster and Td,2.YMQ
shows more of the technical details. [B~*88T
92 * LightTools Introductory Tutorial Wo)$* ?
2<$pai"yl
HAPTER 5 Introduction to Backlight Design o3 b=) E
C D6+^Qmu"p
1.Rotate and zoom the model to that you can see something like the illustration ob3)bI oM
below: ~mBY_[_s=
. we:P_\6
2.To reveal the Property Zones: +O$ `8a)m
a.Right-click in the Design View and select View Preferences to display this i~Q nw-^B
dialog box. 2i9FzpC 3
b.On the Visibility tab, click the Property Zone check box to turn it on. K
HyVI6N[
c.Click OK. l,fwF ua
You will see the wire frame rendering of the spherical bumps on the _uXb 9
bottom surface, and a solid color above it. The solid color is the 3D texture d1jg3{pwA
of the BEFs (brightness-enhancing films) built automatically by the utility.
