The default number of bumps is 100 (10 X 10). You need to change these AWsO? |YT
parameters to match your design. Note that LightTools allows many other Vcz Ex P
placement options, but you will use the Bezier placement option for this mjO4 GpG3
example. /5 B{szf
5.On both the X Placement tab and Y Placement tab, change the Number of XrS . [
Bumps parameter to 300, as shown in the following figure. Click Apply after Ch%W
C ,
each change. /.9j$iK#
6.Click OK to close the dialog box. X|^E+
`M4
Note that the number of bumps is 300 X 300, which results in about 90,000 7(rNJPrU~=
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a tsVQX vo
manner defined by the Bezier parameterization option. Please see Chapter 5 of f=]+\0MQ
the LightTools Core Module User’s Guide for more information. With the /{vv n
current parameter values, the Bezier option varies the bump spacing along the qqA(Swe)T
length of the light guide. The spacing in the orthogonal direction is constant. qL.1N~$2
The X and Y refer to the local coordinate system of the surface. )XV|D
LightTools Introductory Tutorial * 91 \W=~@k
`9E:V=
HAPTER 5 Introduction to Backlight Design 3TVp
oB`
C 6My=GBy C
Examining Surface Properties 9\ZlRYnc=
Using the methods described in previous chapters, you may want to check your ^2%_AP0=
model before you run a simulation. 2a8ZU{wjn
Click on various parts of the model in the 3D Design View. Or use the System .lAqD-
Navigator to select different surfaces and view their Properties. eQ`TW'[9_6
1.In the System Navigator, click to open BottomSurface of the LightGuide, then /yPFts_q
click Zones, and then click Texture. @8E mY,{;
2.Select SphericalElement, and then right-click and select Properties from the h}r*
shortcut menu. The Shape tab shows you a graphical representation of the !
7A _UA8
spherical bump shape that is the bottom of the light guide. `T7gfb%1-3
You might be curious as to why you cannot see the 3D texture property zones you R_ymTB}<t(
defined. They are invisible by default, because drawing thousands of texture F^.w:ad9<
elements can make displaying and exploring the model somewhat slow. If you (jd)sf6Tj[
choose to make them visible, 3D textures are displayed in wireframe, even if the MkgeECMf
display mode is set to translucent. Wireframe rendering displays a bit faster and ,e$]jC<sv2
shows more of the technical details. &6<>hqR^
92 * LightTools Introductory Tutorial t0h @i`
1Q"w)Ta
HAPTER 5 Introduction to Backlight Design ^kJ(bBY
C -x)Oo`
1.Rotate and zoom the model to that you can see something like the illustration x O?w 8 *d
below: 'X_8j` ]#
. i s}6cR
2.To reveal the Property Zones: `>KB8SY:qK
a.Right-click in the Design View and select View Preferences to display this P DQC^2Z
dialog box. 3Kuu9< 0
b.On the Visibility tab, click the Property Zone check box to turn it on. CeQL8 yJ;
c.Click OK. Ks'msSMC
You will see the wire frame rendering of the spherical bumps on the G u[G_^>
bottom surface, and a solid color above it. The solid color is the 3D texture ,l/~epx4v)
of the BEFs (brightness-enhancing films) built automatically by the utility.
