The default number of bumps is 100 (10 X 10). You need to change these DNgQ.lV
parameters to match your design. Note that LightTools allows many other ET u7G5?
placement options, but you will use the Bezier placement option for this kvU0 $1
example. eYL7G-3
5.On both the X Placement tab and Y Placement tab, change the Number of uj.~ /W1,!
Bumps parameter to 300, as shown in the following figure. Click Apply after + mBJvrI
each change. V/j ]UK0$
6.Click OK to close the dialog box. *
*?mZtF
Note that the number of bumps is 300 X 300, which results in about 90,000 NJYx.TL
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Z_%}pe39B
manner defined by the Bezier parameterization option. Please see Chapter 5 of
]
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the LightTools Core Module User’s Guide for more information. With the Q*TxjE7K
current parameter values, the Bezier option varies the bump spacing along the k&nhF9Y 4
length of the light guide. The spacing in the orthogonal direction is constant. !$q1 m@K1
The X and Y refer to the local coordinate system of the surface. (vIrXF5Dnj
LightTools Introductory Tutorial * 91 l<<G". ?
2|k*rv}l
HAPTER 5 Introduction to Backlight Design Ar kFC
C -;$+`<%
Examining Surface Properties 39!o!_g
Using the methods described in previous chapters, you may want to check your ~L(_q]
model before you run a simulation. *$(=I6b
Click on various parts of the model in the 3D Design View. Or use the System UT [9ER S
Navigator to select different surfaces and view their Properties. 3 )f=Z2U>
1.In the System Navigator, click to open BottomSurface of the LightGuide, then #( nheL
click Zones, and then click Texture. }iy`Ko+B"b
2.Select SphericalElement, and then right-click and select Properties from the wAHb 5>!
shortcut menu. The Shape tab shows you a graphical representation of the |-7<?aw"
spherical bump shape that is the bottom of the light guide. )Jx!VJ^Y
You might be curious as to why you cannot see the 3D texture property zones you VGcl)fIqw?
defined. They are invisible by default, because drawing thousands of texture < /y V
elements can make displaying and exploring the model somewhat slow. If you rL URP2~
choose to make them visible, 3D textures are displayed in wireframe, even if the FH8?W|
G
display mode is set to translucent. Wireframe rendering displays a bit faster and hoC}@8_
shows more of the technical details. @];#4 O
92 * LightTools Introductory Tutorial a73b/_zZ=
@{_PO {=\C
HAPTER 5 Introduction to Backlight Design hvBuQuk)
C ilK8V4k<T)
1.Rotate and zoom the model to that you can see something like the illustration Pi?*rr5WZ
below: y_"G Mw
. 6,G^iv6H
2.To reveal the Property Zones: <YL\E v/[
a.Right-click in the Design View and select View Preferences to display this :0T]p"y4
dialog box. }jd[>zk
b.On the Visibility tab, click the Property Zone check box to turn it on. 9BANCW"
c.Click OK. Oe9{`~
You will see the wire frame rendering of the spherical bumps on the SU#
S'
bottom surface, and a solid color above it. The solid color is the 3D texture p)ZlQ .d#Y
of the BEFs (brightness-enhancing films) built automatically by the utility.
