The default number of bumps is 100 (10 X 10). You need to change these {F :v$ K
parameters to match your design. Note that LightTools allows many other CjQ"o Qw
placement options, but you will use the Bezier placement option for this ~9?U_ahfVt
example. zcB 2[eaV
5.On both the X Placement tab and Y Placement tab, change the Number of @LKG\zYBu
Bumps parameter to 300, as shown in the following figure. Click Apply after $a\Uv0:xRx
each change. !/}FPM_
6.Click OK to close the dialog box. %?f:"
Note that the number of bumps is 300 X 300, which results in about 90,000 u 7"VeTz
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a "F "_G
manner defined by the Bezier parameterization option. Please see Chapter 5 of h_~|O [5|)
the LightTools Core Module User’s Guide for more information. With the c,q"} nE8w
current parameter values, the Bezier option varies the bump spacing along the %%~}Lw
length of the light guide. The spacing in the orthogonal direction is constant. _?s %MNaX
The X and Y refer to the local coordinate system of the surface. p%"yBpSK
LightTools Introductory Tutorial * 91 DAnb.0
WkaR{{nM
HAPTER 5 Introduction to Backlight Design s$Zq/l$1x
C .NkAD-k`
Examining Surface Properties g?~ Tguv
Using the methods described in previous chapters, you may want to check your n`)7Y`hBhP
model before you run a simulation. "Py Wo
Click on various parts of the model in the 3D Design View. Or use the System d>, V
Navigator to select different surfaces and view their Properties. ~" 0@u
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Lq-33#n/
click Zones, and then click Texture. ^$IZLM?E ~
2.Select SphericalElement, and then right-click and select Properties from the ahtYSz_FM
shortcut menu. The Shape tab shows you a graphical representation of the o} =.
spherical bump shape that is the bottom of the light guide. +%wWSZ<#
You might be curious as to why you cannot see the 3D texture property zones you 7"q+"0G
defined. They are invisible by default, because drawing thousands of texture y-#
elements can make displaying and exploring the model somewhat slow. If you MdH97L)L.0
choose to make them visible, 3D textures are displayed in wireframe, even if the tKZ&1E
display mode is set to translucent. Wireframe rendering displays a bit faster and
gt_X A H
shows more of the technical details. y?#9>S >:\
92 * LightTools Introductory Tutorial S9p?*
'e]HP-Y<
HAPTER 5 Introduction to Backlight Design 0zbLc%
C T;!ukGoFP
1.Rotate and zoom the model to that you can see something like the illustration JA)o@[l F
below: '_ qQrP#
. (a
`FS,M
2.To reveal the Property Zones: nG"n-$A?<
a.Right-click in the Design View and select View Preferences to display this pDq#8*q+v
dialog box. qWO]s=V!
b.On the Visibility tab, click the Property Zone check box to turn it on. k(EMp1[:nN
c.Click OK. mF'-Is
You will see the wire frame rendering of the spherical bumps on the mP pvZ
bottom surface, and a solid color above it. The solid color is the 3D texture -\kXH"%
of the BEFs (brightness-enhancing films) built automatically by the utility.
