The default number of bumps is 100 (10 X 10). You need to change these g)$KN,gGuO
parameters to match your design. Note that LightTools allows many other W*_c*
placement options, but you will use the Bezier placement option for this 6E1~dK0t
example. ZQKo ]Kdr
5.On both the X Placement tab and Y Placement tab, change the Number of l/nBin&YGv
Bumps parameter to 300, as shown in the following figure. Click Apply after zvq}7,
each change. Vi^vG`L 9
6.Click OK to close the dialog box. Z]DZ :dF
Note that the number of bumps is 300 X 300, which results in about 90,000 #7'k'(
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a t@MUNW`Q
manner defined by the Bezier parameterization option. Please see Chapter 5 of I2RXw
the LightTools Core Module User’s Guide for more information. With the a]5y
CBm
current parameter values, the Bezier option varies the bump spacing along the U" 3L
length of the light guide. The spacing in the orthogonal direction is constant. GLZ*5kw
The X and Y refer to the local coordinate system of the surface. LdOme [C1
LightTools Introductory Tutorial * 91 Vfk"}k/do
C_q 2bI
HAPTER 5 Introduction to Backlight Design D8~\*0->
C c*zeO@AAn
Examining Surface Properties ND.(N'/O
Using the methods described in previous chapters, you may want to check your /\mYXi \
model before you run a simulation. 8O{V#aop
Click on various parts of the model in the 3D Design View. Or use the System k1yqe rA
Navigator to select different surfaces and view their Properties. 3[_WTwX0
1.In the System Navigator, click to open BottomSurface of the LightGuide, then eE
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click Zones, and then click Texture. 3$P
2.Select SphericalElement, and then right-click and select Properties from the (X5y%~;V5a
shortcut menu. The Shape tab shows you a graphical representation of the W vu 1?
spherical bump shape that is the bottom of the light guide. *6AqRE
You might be curious as to why you cannot see the 3D texture property zones you +eH`mI0f
defined. They are invisible by default, because drawing thousands of texture L.-qTh ^P
elements can make displaying and exploring the model somewhat slow. If you j(;ou?Uh
choose to make them visible, 3D textures are displayed in wireframe, even if the 90iv eb21}
display mode is set to translucent. Wireframe rendering displays a bit faster and I!9>"s12
shows more of the technical details. qj:[NPwaM
92 * LightTools Introductory Tutorial [hot,\+f
>}NnzZ
HAPTER 5 Introduction to Backlight Design XA>u CJf
C KTmwkZcfYD
1.Rotate and zoom the model to that you can see something like the illustration Uea2WJpX
below: . bUmT !
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2.To reveal the Property Zones: ~(tt.l#
a.Right-click in the Design View and select View Preferences to display this 2g5 4<G*e
dialog box. ARnq~E@1
b.On the Visibility tab, click the Property Zone check box to turn it on. ,+h<qBsV@
c.Click OK. I
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You will see the wire frame rendering of the spherical bumps on the Lh-Y5(c
o
bottom surface, and a solid color above it. The solid color is the 3D texture reYIF*
of the BEFs (brightness-enhancing films) built automatically by the utility.
