The default number of bumps is 100 (10 X 10). You need to change these '#u2q=n4*
parameters to match your design. Note that LightTools allows many other bs%]xf
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placement options, but you will use the Bezier placement option for this 3S'V>:
example. ) : Q5u6
5.On both the X Placement tab and Y Placement tab, change the Number of %z8@;
Bumps parameter to 300, as shown in the following figure. Click Apply after _2f}WY3S
each change. Q
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6.Click OK to close the dialog box. uvD 6uIW<
Note that the number of bumps is 300 X 300, which results in about 90,000 h/-7;Csv
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 4B (*{
manner defined by the Bezier parameterization option. Please see Chapter 5 of YF&SH)Y7
the LightTools Core Module User’s Guide for more information. With the #J^p,6
current parameter values, the Bezier option varies the bump spacing along the \UtUP#Y{t
length of the light guide. The spacing in the orthogonal direction is constant. +u25>pX
The X and Y refer to the local coordinate system of the surface. y~ ^>my7G
LightTools Introductory Tutorial * 91 ] ^
<| Z0|sel
HAPTER 5 Introduction to Backlight Design pklcRrx,a
C 3%|<U51
Examining Surface Properties iP' }eQn]c
Using the methods described in previous chapters, you may want to check your #) cRD#0
model before you run a simulation. s#*
mn
Click on various parts of the model in the 3D Design View. Or use the System '[\%P2c)Q
Navigator to select different surfaces and view their Properties. y7,~7f!N2
1.In the System Navigator, click to open BottomSurface of the LightGuide, then jGt'S{
click Zones, and then click Texture. 5\QNGRu"
2.Select SphericalElement, and then right-click and select Properties from the z{!wQ~
j
shortcut menu. The Shape tab shows you a graphical representation of the F<IqKgGzH
spherical bump shape that is the bottom of the light guide. vkbB~gr@*
You might be curious as to why you cannot see the 3D texture property zones you nV ']^3b
defined. They are invisible by default, because drawing thousands of texture rw+0<r3|K
elements can make displaying and exploring the model somewhat slow. If you m\@Q/_ v
choose to make them visible, 3D textures are displayed in wireframe, even if the z:< (b
display mode is set to translucent. Wireframe rendering displays a bit faster and 3P-#NL
shows more of the technical details. 2px5>4<
92 * LightTools Introductory Tutorial
QW6k!ms$
BKvF,f/g
HAPTER 5 Introduction to Backlight Design 8h AI l
C #+ n
&
1.Rotate and zoom the model to that you can see something like the illustration OtQKDpJq
below: TTy1a:V
. I X\& lV
2.To reveal the Property Zones: q &jW{
a.Right-click in the Design View and select View Preferences to display this HJg)c;u/2;
dialog box. hb?
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b.On the Visibility tab, click the Property Zone check box to turn it on.
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c.Click OK. Y71b
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You will see the wire frame rendering of the spherical bumps on the *q8W;Wa L
bottom surface, and a solid color above it. The solid color is the 3D texture WWE?U-o
of the BEFs (brightness-enhancing films) built automatically by the utility.
