The default number of bumps is 100 (10 X 10). You need to change these z`>a,X
parameters to match your design. Note that LightTools allows many other wC'KI8-
placement options, but you will use the Bezier placement option for this -md2Z0^ Kc
example. dUOjPq97
5.On both the X Placement tab and Y Placement tab, change the Number of eey <:n/Z
Bumps parameter to 300, as shown in the following figure. Click Apply after QVn!60[lj
each change. /M v\~vg$1
6.Click OK to close the dialog box. T* -*U /
Note that the number of bumps is 300 X 300, which results in about 90,000 4x e:+sA.N
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a </:f-J%U/
manner defined by the Bezier parameterization option. Please see Chapter 5 of /=,^fCCN
the LightTools Core Module User’s Guide for more information. With the 9SC#N 5V
current parameter values, the Bezier option varies the bump spacing along the @ g~kp
length of the light guide. The spacing in the orthogonal direction is constant. G/2@ Mn-
The X and Y refer to the local coordinate system of the surface. 6:Z qS~-
LightTools Introductory Tutorial * 91 Ml +.\'r
CH`4FR.-
HAPTER 5 Introduction to Backlight Design Wy)|-Q7
C zP
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Examining Surface Properties [M@i,d-;A
Using the methods described in previous chapters, you may want to check your pWbzBgM?nU
model before you run a simulation. UFouIS #L
Click on various parts of the model in the 3D Design View. Or use the System }@SZ!-t%rD
Navigator to select different surfaces and view their Properties. @bfaAh~
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 6\OSIxJZF
click Zones, and then click Texture. [3t
N-aj[
2.Select SphericalElement, and then right-click and select Properties from the ^dYF FKQ
shortcut menu. The Shape tab shows you a graphical representation of the F@"X d9q?
spherical bump shape that is the bottom of the light guide. TjgX ' j
You might be curious as to why you cannot see the 3D texture property zones you z} )H$]: $
defined. They are invisible by default, because drawing thousands of texture y !47!Dn
elements can make displaying and exploring the model somewhat slow. If you R 4E0avt
choose to make them visible, 3D textures are displayed in wireframe, even if the j05ahquI
display mode is set to translucent. Wireframe rendering displays a bit faster and vb{&T<
shows more of the technical details. _
nS';48
92 * LightTools Introductory Tutorial Vu^J' >X
j=PQoEtU'<
HAPTER 5 Introduction to Backlight Design oel3H 5Nz
C
|cWW5\/
1.Rotate and zoom the model to that you can see something like the illustration <W|{zAyv
below: *)L%pH>`
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2.To reveal the Property Zones: T>kJB.V:oQ
a.Right-click in the Design View and select View Preferences to display this fnL!@W F
dialog box. K&D
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b.On the Visibility tab, click the Property Zone check box to turn it on. W-7yi `5
c.Click OK. x%vt$dy*8
You will see the wire frame rendering of the spherical bumps on the k-b_
<Tbo|
bottom surface, and a solid color above it. The solid color is the 3D texture 0N_Ma' )i
of the BEFs (brightness-enhancing films) built automatically by the utility.
