The default number of bumps is 100 (10 X 10). You need to change these c]>s(/}T
parameters to match your design. Note that LightTools allows many other gc 14 %
placement options, but you will use the Bezier placement option for this Zu\(XN?62
example. sS, Swgr
5.On both the X Placement tab and Y Placement tab, change the Number of Y. ]FVq
Bumps parameter to 300, as shown in the following figure. Click Apply after 2<Tbd"x?
each change. *7C t#GC
6.Click OK to close the dialog box. " r!O9X6
Note that the number of bumps is 300 X 300, which results in about 90,000 1 f ]04TI
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ~Cx07I_lf
manner defined by the Bezier parameterization option. Please see Chapter 5 of /2K4ka<?7
the LightTools Core Module User’s Guide for more information. With the J~6+z BF
current parameter values, the Bezier option varies the bump spacing along the $ ZD1_sJ.
length of the light guide. The spacing in the orthogonal direction is constant. CBA MAr
The X and Y refer to the local coordinate system of the surface. ,F7W_f#
@3
LightTools Introductory Tutorial * 91 r^mP'#
u% <Je
HAPTER 5 Introduction to Backlight Design aU,Zjm7fp
C K14e"w%6rs
Examining Surface Properties %nQii? 1`i
Using the methods described in previous chapters, you may want to check your N<1u,[+
model before you run a simulation. _\YBB=Os
Click on various parts of the model in the 3D Design View. Or use the System "P<I Qx
Navigator to select different surfaces and view their Properties. 5-M E Oy(
1.In the System Navigator, click to open BottomSurface of the LightGuide, then epsh&)5a*
click Zones, and then click Texture. 0Zp)
DM
2.Select SphericalElement, and then right-click and select Properties from the 5:%xuJD
shortcut menu. The Shape tab shows you a graphical representation of the
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spherical bump shape that is the bottom of the light guide. P#(BdKjM
You might be curious as to why you cannot see the 3D texture property zones you 7*8R:X+^r
defined. They are invisible by default, because drawing thousands of texture k{<]J5{7
elements can make displaying and exploring the model somewhat slow. If you R _WP r[P
choose to make them visible, 3D textures are displayed in wireframe, even if the $<.\,wW*'w
display mode is set to translucent. Wireframe rendering displays a bit faster and Z,%^BAJ
shows more of the technical details. D<5;4Mb
92 * LightTools Introductory Tutorial \ jDD=ew
I@a y&NNh
HAPTER 5 Introduction to Backlight Design nqNL[w6{
C j:# wt70
1.Rotate and zoom the model to that you can see something like the illustration Eg&xIyR mm
below: ES[H^}|Gi
. )?#*GMWU
2.To reveal the Property Zones: ezn%*X
y,
a.Right-click in the Design View and select View Preferences to display this Tf/jd 3>
dialog box. _ KBN
b.On the Visibility tab, click the Property Zone check box to turn it on. z^z_!@7v
c.Click OK. n $RhD93
You will see the wire frame rendering of the spherical bumps on the T
2 2tZp
bottom surface, and a solid color above it. The solid color is the 3D texture InnjZ>$
of the BEFs (brightness-enhancing films) built automatically by the utility.
