The default number of bumps is 100 (10 X 10). You need to change these mp(:D&M
parameters to match your design. Note that LightTools allows many other U .^%7.
placement options, but you will use the Bezier placement option for this ^|rzqXW
example. k~<ORnda
5.On both the X Placement tab and Y Placement tab, change the Number of 96F+I!qC
Bumps parameter to 300, as shown in the following figure. Click Apply after yP@#1KLa+
each change. p0Ij 4
6.Click OK to close the dialog box. ?5d[BV
Note that the number of bumps is 300 X 300, which results in about 90,000 Jn?Z JZ
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a aFrZ
;_
manner defined by the Bezier parameterization option. Please see Chapter 5 of \3U.;}0_X
the LightTools Core Module User’s Guide for more information. With the "$% &C%t
current parameter values, the Bezier option varies the bump spacing along the J{uqbrJICr
length of the light guide. The spacing in the orthogonal direction is constant. W}(xE?9&
The X and Y refer to the local coordinate system of the surface. ABtv|0 K
LightTools Introductory Tutorial * 91 :Z; kMrU
"[ L+LPET
HAPTER 5 Introduction to Backlight Design Hn)^C{RN*{
C B$97"$#u
Examining Surface Properties ~ebm,3?
Using the methods described in previous chapters, you may want to check your = p2AK\
model before you run a simulation. :NwFJc
Click on various parts of the model in the 3D Design View. Or use the System y3'K+ ? 4
Navigator to select different surfaces and view their Properties. 4%jSqT@
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Y -DHW/Z~
click Zones, and then click Texture. < m`Os2#
2.Select SphericalElement, and then right-click and select Properties from the d5LL(
"
shortcut menu. The Shape tab shows you a graphical representation of the >?X(, c
spherical bump shape that is the bottom of the light guide. FO|Eg9l
You might be curious as to why you cannot see the 3D texture property zones you jA%R8hdr_
defined. They are invisible by default, because drawing thousands of texture %8% 0l*n'
elements can make displaying and exploring the model somewhat slow. If you
3AuLRI
choose to make them visible, 3D textures are displayed in wireframe, even if the L|2WTyMU
display mode is set to translucent. Wireframe rendering displays a bit faster and ss7Z-A 4z
shows more of the technical details. 1NlpOVq:)
92 * LightTools Introductory Tutorial UD ]RWN
)Oj%3
HAPTER 5 Introduction to Backlight Design y=y#*yn &
C G`jJKiC
1.Rotate and zoom the model to that you can see something like the illustration Bd13p_V"6
below: s)~H_ ,
. P<xCg
2.To reveal the Property Zones: g>f_'7F&
a.Right-click in the Design View and select View Preferences to display this \9.@T g8`
dialog box. 9 [\$\l
b.On the Visibility tab, click the Property Zone check box to turn it on. SC0_ h(zb,
c.Click OK. za4:Jdr
You will see the wire frame rendering of the spherical bumps on the ]:]w+N%7
bottom surface, and a solid color above it. The solid color is the 3D texture /{X2:g {
of the BEFs (brightness-enhancing films) built automatically by the utility.
