The default number of bumps is 100 (10 X 10). You need to change these SF*mY=1
parameters to match your design. Note that LightTools allows many other Uz,P^\8^$
placement options, but you will use the Bezier placement option for this W|@SXO)DY
example. F/lL1nTdK
5.On both the X Placement tab and Y Placement tab, change the Number of @x Bb|/I
Bumps parameter to 300, as shown in the following figure. Click Apply after ]~dB| WB
each change. Gdb0e]Vt+
6.Click OK to close the dialog box. `Zo5!"'
Note that the number of bumps is 300 X 300, which results in about 90,000 nbP}a?XC
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a !p+rU?
manner defined by the Bezier parameterization option. Please see Chapter 5 of OfB Wf6b
the LightTools Core Module User’s Guide for more information. With the 6x(b/`V W
current parameter values, the Bezier option varies the bump spacing along the ym6Emf]
length of the light guide. The spacing in the orthogonal direction is constant. #S/~1{
The X and Y refer to the local coordinate system of the surface. n8!|}J
LightTools Introductory Tutorial * 91 /_cpS q
|>U<EtA"
HAPTER 5 Introduction to Backlight Design ?^!J:D?
C :/=P6b;
Examining Surface Properties [7DU0Xg7
Using the methods described in previous chapters, you may want to check your M^ WoV
}'
model before you run a simulation. Th%w-19,8
Click on various parts of the model in the 3D Design View. Or use the System XU}i<5
Navigator to select different surfaces and view their Properties. wjX0r7^@
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ._x"b5C
click Zones, and then click Texture. xP1D 9
2.Select SphericalElement, and then right-click and select Properties from the otjT ?R2g'
shortcut menu. The Shape tab shows you a graphical representation of the }. |a0N 5
spherical bump shape that is the bottom of the light guide. s!YX<V
You might be curious as to why you cannot see the 3D texture property zones you \ :@! rM
defined. They are invisible by default, because drawing thousands of texture Z%.L d2Q{
elements can make displaying and exploring the model somewhat slow. If you cqh1,h$sG
choose to make them visible, 3D textures are displayed in wireframe, even if the E "BW-<_!
display mode is set to translucent. Wireframe rendering displays a bit faster and ',FVT4OMw
shows more of the technical details. fvTp9T\f3
92 * LightTools Introductory Tutorial
2i6P<&@
e
jk?If 07
HAPTER 5 Introduction to Backlight Design C ;ha2UV0H
C }o
G MF~
1.Rotate and zoom the model to that you can see something like the illustration p |;#frj
below: p,8:(|(
. mrE> o !
2.To reveal the Property Zones: d<\X )-"
a.Right-click in the Design View and select View Preferences to display this I
%1 P:-
dialog box. 4yxf/X)
b.On the Visibility tab, click the Property Zone check box to turn it on. P& o+ut:
c.Click OK. w"Zws[pm]
You will see the wire frame rendering of the spherical bumps on the @&G
%cW (
bottom surface, and a solid color above it. The solid color is the 3D texture o~:({
of the BEFs (brightness-enhancing films) built automatically by the utility.
