The default number of bumps is 100 (10 X 10). You need to change these ^|Oxl fS
parameters to match your design. Note that LightTools allows many other ql^n=+U
placement options, but you will use the Bezier placement option for this PYW~x@]k%,
example. CSIW|R@
5.On both the X Placement tab and Y Placement tab, change the Number of ys09W+B7
Bumps parameter to 300, as shown in the following figure. Click Apply after wR\%tumk
each change. q,kd r)-
6.Click OK to close the dialog box. Fb.wm
Note that the number of bumps is 300 X 300, which results in about 90,000 b$%W<D
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a U H
`=
manner defined by the Bezier parameterization option. Please see Chapter 5 of 1@;D n'
the LightTools Core Module User’s Guide for more information. With the +>Y2luR1
current parameter values, the Bezier option varies the bump spacing along the CO-9-sQx
length of the light guide. The spacing in the orthogonal direction is constant. t 8|i> (O
The X and Y refer to the local coordinate system of the surface. f6u<.b
LightTools Introductory Tutorial * 91 =J<3B
H^m
0.=dOz r
HAPTER 5 Introduction to Backlight Design !w{4FE74
C G[ @RZ~o4
Examining Surface Properties d3<7 t
Using the methods described in previous chapters, you may want to check your /Rf:Z.L
model before you run a simulation. Y'mtMLfMc
Click on various parts of the model in the 3D Design View. Or use the System K>N\U@@8i
Navigator to select different surfaces and view their Properties. : tdN#m6&
1.In the System Navigator, click to open BottomSurface of the LightGuide, then xN'$ Yh
click Zones, and then click Texture. U]ynnw4
2.Select SphericalElement, and then right-click and select Properties from the jH({Qc,97
shortcut menu. The Shape tab shows you a graphical representation of the I w~R@,
spherical bump shape that is the bottom of the light guide. 58V`I5_
You might be curious as to why you cannot see the 3D texture property zones you 4hz T4!15
defined. They are invisible by default, because drawing thousands of texture Y;-$w|&P>
elements can make displaying and exploring the model somewhat slow. If you +Hgil
choose to make them visible, 3D textures are displayed in wireframe, even if the of659~EIW
display mode is set to translucent. Wireframe rendering displays a bit faster and TD!--l*gL
shows more of the technical details. <Z5-?wgf9
92 * LightTools Introductory Tutorial l|9' M'a
<A^sg?s<'
HAPTER 5 Introduction to Backlight Design %|AebxB'o
C @IhC:Yc
1.Rotate and zoom the model to that you can see something like the illustration #oW" 3L{,
below: XXPn)kmWR
. 9sG]Q[:.]
2.To reveal the Property Zones: VkdG GY
a.Right-click in the Design View and select View Preferences to display this iO+,U} &
dialog box. xsu9DzPf&{
b.On the Visibility tab, click the Property Zone check box to turn it on. )0+6^[Tqq
c.Click OK. 4P jC[A*
You will see the wire frame rendering of the spherical bumps on the _rM?g1}5j
bottom surface, and a solid color above it. The solid color is the 3D texture }@x!r=O)I
of the BEFs (brightness-enhancing films) built automatically by the utility.
