The default number of bumps is 100 (10 X 10). You need to change these VH M&Y-G
parameters to match your design. Note that LightTools allows many other P.aN 4 9`=
placement options, but you will use the Bezier placement option for this 2+s#5K&i
example. /0 CS2mLC
5.On both the X Placement tab and Y Placement tab, change the Number of A*^aBWFR
Bumps parameter to 300, as shown in the following figure. Click Apply after @S9^~W3G3
each change. OGcq]ue
6.Click OK to close the dialog box. P8[rp
Note that the number of bumps is 300 X 300, which results in about 90,000 >UNx<=ry
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a c]}F$[>oN'
manner defined by the Bezier parameterization option. Please see Chapter 5 of +adwEYRrr
the LightTools Core Module User’s Guide for more information. With the ?*LVn~y
current parameter values, the Bezier option varies the bump spacing along the q]Vxf!0*>
length of the light guide. The spacing in the orthogonal direction is constant. ,i)wS1@
The X and Y refer to the local coordinate system of the surface. )[wB:kG
LightTools Introductory Tutorial * 91 fQQj2> 3w
717S3knlv
HAPTER 5 Introduction to Backlight Design #fy3 i+
C X rl# DN
Examining Surface Properties ~)CGwST [
Using the methods described in previous chapters, you may want to check your 7 D&O5Z=%+
model before you run a simulation. Y]VLou zl
Click on various parts of the model in the 3D Design View. Or use the System {^":^N)
Navigator to select different surfaces and view their Properties. V9Pw\K!w#\
1.In the System Navigator, click to open BottomSurface of the LightGuide, then WA((>Daf]
click Zones, and then click Texture. g286
P_a`*
2.Select SphericalElement, and then right-click and select Properties from the n{$! ]^>
shortcut menu. The Shape tab shows you a graphical representation of the C&HN#Q_
spherical bump shape that is the bottom of the light guide. F/
o }5H
You might be curious as to why you cannot see the 3D texture property zones you 3!M|Sf<s
defined. They are invisible by default, because drawing thousands of texture dOX"7kZ
elements can make displaying and exploring the model somewhat slow. If you >npTUOGL=n
choose to make them visible, 3D textures are displayed in wireframe, even if the [,L>5:T
display mode is set to translucent. Wireframe rendering displays a bit faster and >t#5eT`_ w
shows more of the technical details. Tm\a%Z`U>
92 * LightTools Introductory Tutorial [[#zB-|
#$X _,+<HZ
HAPTER 5 Introduction to Backlight Design U0=: `G2l
C S-5O$EnD
1.Rotate and zoom the model to that you can see something like the illustration R0~w F>
below: mor[ AJ
. AO]k*N,N
2.To reveal the Property Zones: LEuDDJ -
a.Right-click in the Design View and select View Preferences to display this U4=m>Ty
dialog box. A01PEVd@A
b.On the Visibility tab, click the Property Zone check box to turn it on. >N~orSw%
c.Click OK. 1>=%TIO)
You will see the wire frame rendering of the spherical bumps on the 6L"b O'_5K
bottom surface, and a solid color above it. The solid color is the 3D texture )=nB32~J"
of the BEFs (brightness-enhancing films) built automatically by the utility.
