The default number of bumps is 100 (10 X 10). You need to change these dry%a T
parameters to match your design. Note that LightTools allows many other Sl
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placement options, but you will use the Bezier placement option for this ^Y8G}Z|
example. i!<(R$ Lo
5.On both the X Placement tab and Y Placement tab, change the Number of ;ae6h
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Bumps parameter to 300, as shown in the following figure. Click Apply after Fv nf;']q
each change. ?f5||^7
6.Click OK to close the dialog box. 6hFs{P7
Note that the number of bumps is 300 X 300, which results in about 90,000 hig t(u
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a UU#$Kt*frR
manner defined by the Bezier parameterization option. Please see Chapter 5 of O`~L*h_
the LightTools Core Module User’s Guide for more information. With the 5a &gdqg]
current parameter values, the Bezier option varies the bump spacing along the \pI
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length of the light guide. The spacing in the orthogonal direction is constant. g,Rh Ut9
The X and Y refer to the local coordinate system of the surface. A n
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LightTools Introductory Tutorial * 91 %2?"x*A
[2
Rz8e^
HAPTER 5 Introduction to Backlight Design [eDR ghK
C B\dhw @hM
Examining Surface Properties E
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Using the methods described in previous chapters, you may want to check your 1aUu:#c
model before you run a simulation. ;~}!P7z
Click on various parts of the model in the 3D Design View. Or use the System |c2;`T#`o
Navigator to select different surfaces and view their Properties. 1u*
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1.In the System Navigator, click to open BottomSurface of the LightGuide, then x
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click Zones, and then click Texture. `K2vG`c
2.Select SphericalElement, and then right-click and select Properties from the a
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shortcut menu. The Shape tab shows you a graphical representation of the %VrMlG4hx
spherical bump shape that is the bottom of the light guide. #hEU)G' $+
You might be curious as to why you cannot see the 3D texture property zones you You~
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defined. They are invisible by default, because drawing thousands of texture *m 6*sIR
elements can make displaying and exploring the model somewhat slow. If you D6P/39}W
choose to make them visible, 3D textures are displayed in wireframe, even if the N VDvd6
display mode is set to translucent. Wireframe rendering displays a bit faster and 368H6 Jj
shows more of the technical details. od3b, Q
92 * LightTools Introductory Tutorial 8PGuZw<
NE@P8pQ>
HAPTER 5 Introduction to Backlight Design 7.
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C ><)fK5x
1.Rotate and zoom the model to that you can see something like the illustration u3PM 7z!~
below: ]mi)x6 3^
. 7{[i)
2.To reveal the Property Zones: <yKyM#4X
a.Right-click in the Design View and select View Preferences to display this (8GA;:G7G
dialog box. )U2%kmt
b.On the Visibility tab, click the Property Zone check box to turn it on. W6yz/{Rf
c.Click OK. :XO7#P
You will see the wire frame rendering of the spherical bumps on the a S+i`A :a
bottom surface, and a solid color above it. The solid color is the 3D texture B=i%Z _r]w
of the BEFs (brightness-enhancing films) built automatically by the utility.
