The default number of bumps is 100 (10 X 10). You need to change these "Jf4N
parameters to match your design. Note that LightTools allows many other " S ?Km
placement options, but you will use the Bezier placement option for this f>|9 l
example. ysL0 hwir
5.On both the X Placement tab and Y Placement tab, change the Number of F{kG
Bumps parameter to 300, as shown in the following figure. Click Apply after m\l51}xz
each change. f(^33k
6.Click OK to close the dialog box. *h >OW
Note that the number of bumps is 300 X 300, which results in about 90,000 bJANZn|H
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a YmZC?x_{M2
manner defined by the Bezier parameterization option. Please see Chapter 5 of pb~Ps#"Zg
the LightTools Core Module User’s Guide for more information. With the z9I1RX V
current parameter values, the Bezier option varies the bump spacing along the P Q6T| >
length of the light guide. The spacing in the orthogonal direction is constant. )iT.A
The X and Y refer to the local coordinate system of the surface.
8u4 gx<;O
LightTools Introductory Tutorial * 91 vM5k4%D
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HAPTER 5 Introduction to Backlight Design zUe#Wp[
C owP6dtd)
Examining Surface Properties Dr4 ?Ow
Using the methods described in previous chapters, you may want to check your B8`R(vu;
model before you run a simulation. e6Wl7&@6
Click on various parts of the model in the 3D Design View. Or use the System 3S;>ki4(0
Navigator to select different surfaces and view their Properties. /,=Wy"0TJ
1.In the System Navigator, click to open BottomSurface of the LightGuide, then U&w *Sb"
click Zones, and then click Texture. .%|OGl ?
2.Select SphericalElement, and then right-click and select Properties from the kt;}] O2%R
shortcut menu. The Shape tab shows you a graphical representation of the ~3L hcU-
spherical bump shape that is the bottom of the light guide. R c$=+K#
You might be curious as to why you cannot see the 3D texture property zones you Uyz;U34 oI
defined. They are invisible by default, because drawing thousands of texture u?F7 L8q]
elements can make displaying and exploring the model somewhat slow. If you Dh*~U :6$g
choose to make them visible, 3D textures are displayed in wireframe, even if the C~3@M<X
display mode is set to translucent. Wireframe rendering displays a bit faster and U/}AiCdj @
shows more of the technical details. r 0rJ.}!
92 * LightTools Introductory Tutorial I|Vk.,
qp luk!
HAPTER 5 Introduction to Backlight Design u40b?
n.
C ;}UIj{sj*
1.Rotate and zoom the model to that you can see something like the illustration =e"H1^Ml
below: %#[r_QQ^
. B^E2 UNRA
2.To reveal the Property Zones: {s9y@c*15.
a.Right-click in the Design View and select View Preferences to display this -MVNXAKnZ
dialog box. \9&YV;Ct
b.On the Visibility tab, click the Property Zone check box to turn it on. yt]Oj*nn0K
c.Click OK. F] dmc,Q
You will see the wire frame rendering of the spherical bumps on the yHa:?u 6
bottom surface, and a solid color above it. The solid color is the 3D texture V\e13cL]
of the BEFs (brightness-enhancing films) built automatically by the utility.
