The default number of bumps is 100 (10 X 10). You need to change these d'UCPg<Y
parameters to match your design. Note that LightTools allows many other !W48sZr1&
placement options, but you will use the Bezier placement option for this -+,3aK<[
example. =H)"t:xE
5.On both the X Placement tab and Y Placement tab, change the Number of V^D!\)#
Bumps parameter to 300, as shown in the following figure. Click Apply after n*nsFvt%o
each change. 96]!*}
6.Click OK to close the dialog box. 1 2 y+g5b
Note that the number of bumps is 300 X 300, which results in about 90,000 {<#~Ya-
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a >og-
jz
manner defined by the Bezier parameterization option. Please see Chapter 5 of a%NSL6
the LightTools Core Module User’s Guide for more information. With the m6iQB\ \
current parameter values, the Bezier option varies the bump spacing along the 5fuB((fd(
length of the light guide. The spacing in the orthogonal direction is constant. [W,} &
The X and Y refer to the local coordinate system of the surface. k r{eC/Q"
LightTools Introductory Tutorial * 91 G~FAChI8![
4O1[D? )`x
HAPTER 5 Introduction to Backlight Design P uodsd
C x17K8 De
Examining Surface Properties /AhN$)(O
Using the methods described in previous chapters, you may want to check your O$, bNu/g
model before you run a simulation. 5rPK7Jh`B
Click on various parts of the model in the 3D Design View. Or use the System )DwHLaLW
Navigator to select different surfaces and view their Properties. IuN:*P
1.In the System Navigator, click to open BottomSurface of the LightGuide, then QsC6 \Gt#
click Zones, and then click Texture. ~J lo>
2.Select SphericalElement, and then right-click and select Properties from the Unc_e
shortcut menu. The Shape tab shows you a graphical representation of the _=ziw|zI
spherical bump shape that is the bottom of the light guide. [_w;= l0 ;
You might be curious as to why you cannot see the 3D texture property zones you x-Ug(/!^
defined. They are invisible by default, because drawing thousands of texture A2{s ?L,
elements can make displaying and exploring the model somewhat slow. If you n"dYN3dE
choose to make them visible, 3D textures are displayed in wireframe, even if the p8_
CY[U
display mode is set to translucent. Wireframe rendering displays a bit faster and ;:#g\|(<+
shows more of the technical details. 45H(.}&f
92 * LightTools Introductory Tutorial k%2Rv4)hU
= k7}[!T
HAPTER 5 Introduction to Backlight Design EI!e0 V1!
C OK \F
1.Rotate and zoom the model to that you can see something like the illustration ,d~6LXr<fM
below: 6>R|B?I%
. d^W1;0
2.To reveal the Property Zones: o{I]c#W
a.Right-click in the Design View and select View Preferences to display this H% ^j yGS
dialog box. tShyG! b
b.On the Visibility tab, click the Property Zone check box to turn it on. VY]L<4BfGL
c.Click OK. gK+/wTQ%
You will see the wire frame rendering of the spherical bumps on the '%\FT-{
bottom surface, and a solid color above it. The solid color is the 3D texture w</qUOx
of the BEFs (brightness-enhancing films) built automatically by the utility.
