The default number of bumps is 100 (10 X 10). You need to change these )(L&+DDy
parameters to match your design. Note that LightTools allows many other Nz}Q"6 L
placement options, but you will use the Bezier placement option for this `2fuV]FW
example. blN1Q%m6
5.On both the X Placement tab and Y Placement tab, change the Number of w%_BX3GTO
Bumps parameter to 300, as shown in the following figure. Click Apply after |wb7` 6g
each change. JZXc1R| 9
6.Click OK to close the dialog box. wwAT@=X*}
Note that the number of bumps is 300 X 300, which results in about 90,000 O^x t
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a aXJe"IT.u
manner defined by the Bezier parameterization option. Please see Chapter 5 of 7}x-({bqy
the LightTools Core Module User’s Guide for more information. With the @iP6 N
current parameter values, the Bezier option varies the bump spacing along the 3
#wj-
length of the light guide. The spacing in the orthogonal direction is constant. "|G,P-5G "
The X and Y refer to the local coordinate system of the surface. 5->PDp
LightTools Introductory Tutorial * 91 ;Pa(nUE@
Td F<
HAPTER 5 Introduction to Backlight Design ~JNuy"8
C $K KaA{ 0-
Examining Surface Properties }6bLukv
Using the methods described in previous chapters, you may want to check your
YiCDV(prT
model before you run a simulation. 1wgu%$|d
Click on various parts of the model in the 3D Design View. Or use the System tQ~B!j]
Navigator to select different surfaces and view their Properties. -&EmE Xs%
1.In the System Navigator, click to open BottomSurface of the LightGuide, then %pp+V1FH
click Zones, and then click Texture. (
7?% Hg
2.Select SphericalElement, and then right-click and select Properties from the op-#Ig$#
shortcut menu. The Shape tab shows you a graphical representation of the o/zCXZnw#
spherical bump shape that is the bottom of the light guide. 0hkuBQb\
You might be curious as to why you cannot see the 3D texture property zones you }gW}Vr <
defined. They are invisible by default, because drawing thousands of texture JB(;[# '~
elements can make displaying and exploring the model somewhat slow. If you UH.cn|R
choose to make them visible, 3D textures are displayed in wireframe, even if the \$C 4H
display mode is set to translucent. Wireframe rendering displays a bit faster and .HBvs=i
shows more of the technical details. RrHnDO'
92 * LightTools Introductory Tutorial g=C<E2'i*
1pb;A;F,A
HAPTER 5 Introduction to Backlight Design S2R[vB4).
C C P#79=1
1.Rotate and zoom the model to that you can see something like the illustration 4cQ5E9
below: QB[s8"S
. 9 ^ r
2.To reveal the Property Zones: Ng"vBycy
a.Right-click in the Design View and select View Preferences to display this &XsLp&Do2
dialog box. ~qS/90 ,
b.On the Visibility tab, click the Property Zone check box to turn it on. re!8nuBsA
c.Click OK. x 5SQ+7
You will see the wire frame rendering of the spherical bumps on the +*J4q5;E[?
bottom surface, and a solid color above it. The solid color is the 3D texture pNli sS
of the BEFs (brightness-enhancing films) built automatically by the utility.
