The default number of bumps is 100 (10 X 10). You need to change these $\a;?>WA"
parameters to match your design. Note that LightTools allows many other {)F-US
placement options, but you will use the Bezier placement option for this a>s v
example. a^ sR?.+3
5.On both the X Placement tab and Y Placement tab, change the Number of TTqOAo[-Z
Bumps parameter to 300, as shown in the following figure. Click Apply after b6Ntt Y!3
each change. f+/^1~^
6.Click OK to close the dialog box. /:%^Vh3XF
Note that the number of bumps is 300 X 300, which results in about 90,000 {d )Et;_
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a mM}|x~\R
manner defined by the Bezier parameterization option. Please see Chapter 5 of /G84T,H
the LightTools Core Module User’s Guide for more information. With the VgoQz]z
current parameter values, the Bezier option varies the bump spacing along the =OjzBiHR
length of the light guide. The spacing in the orthogonal direction is constant. XY%8yII6
The X and Y refer to the local coordinate system of the surface. ((X"D/ F]
LightTools Introductory Tutorial * 91 A"9aEOX-?i
]qpcA6%a|
HAPTER 5 Introduction to Backlight Design s
fti[
C J-X5n 3I&
Examining Surface Properties SSI&WZ2a
Using the methods described in previous chapters, you may want to check your 0<>iMr D
model before you run a simulation. )8 iDjNM <
Click on various parts of the model in the 3D Design View. Or use the System )bcMKZ
Navigator to select different surfaces and view their Properties. h` n>6I
1.In the System Navigator, click to open BottomSurface of the LightGuide, then -F l3m
click Zones, and then click Texture. 6^
KDc
2.Select SphericalElement, and then right-click and select Properties from the zpa 'G1v
shortcut menu. The Shape tab shows you a graphical representation of the r3*w H1n
spherical bump shape that is the bottom of the light guide. Jl^oDW
You might be curious as to why you cannot see the 3D texture property zones you 8# oF7eE
defined. They are invisible by default, because drawing thousands of texture V-X n &s
elements can make displaying and exploring the model somewhat slow. If you Pu*st=KGB
choose to make them visible, 3D textures are displayed in wireframe, even if the TyK;
q{
display mode is set to translucent. Wireframe rendering displays a bit faster and ~I'Z=Wo
shows more of the technical details. {0QA+[Yd&!
92 * LightTools Introductory Tutorial ,e >ugI_;*
$G=\i>R.
HAPTER 5 Introduction to Backlight Design s:fnOMv
"
C FyY;F ;4P
1.Rotate and zoom the model to that you can see something like the illustration $9b||L
below: NS&~n^ *k<
. se)I2T{J
2.To reveal the Property Zones: P- vA.7
a.Right-click in the Design View and select View Preferences to display this =jG3 wf*
dialog box. ,fYO>l';`f
b.On the Visibility tab, click the Property Zone check box to turn it on. &0ULj6j j
c.Click OK. } g
You will see the wire frame rendering of the spherical bumps on the W C`1;(#G
bottom surface, and a solid color above it. The solid color is the 3D texture bUqO.FZ[
of the BEFs (brightness-enhancing films) built automatically by the utility.
