The default number of bumps is 100 (10 X 10). You need to change these Faw. GU
parameters to match your design. Note that LightTools allows many other Q,TaJ ]
placement options, but you will use the Bezier placement option for this &`5 :G LV
example. 7x:F!0 :
5.On both the X Placement tab and Y Placement tab, change the Number of F13%)G(
Bumps parameter to 300, as shown in the following figure. Click Apply after lZ+/\s,]|
each change. p!V) 55J*
6.Click OK to close the dialog box. vKV{
$|
Note that the number of bumps is 300 X 300, which results in about 90,000 '4Y*-!9
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a th;]Vo
manner defined by the Bezier parameterization option. Please see Chapter 5 of )%1&/uN)
the LightTools Core Module User’s Guide for more information. With the /iTH0@Kw;
current parameter values, the Bezier option varies the bump spacing along the q .)^B@}_
length of the light guide. The spacing in the orthogonal direction is constant. f Y2l.H\f
The X and Y refer to the local coordinate system of the surface. :'TX"E!
LightTools Introductory Tutorial * 91 +0)5H>h
UvoG< ;
HAPTER 5 Introduction to Backlight Design _2x uzmz0
C 7{8)ykBU^
Examining Surface Properties 5"] aZMua
Using the methods described in previous chapters, you may want to check your i@%L_[MtA
model before you run a simulation. (jt*u (C&Y
Click on various parts of the model in the 3D Design View. Or use the System ec,z6v^9
Navigator to select different surfaces and view their Properties. HKT{IP+7(L
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ZW `HDrP`
click Zones, and then click Texture. 96 k(X LR
2.Select SphericalElement, and then right-click and select Properties from the gS0,')w
shortcut menu. The Shape tab shows you a graphical representation of the +2f>
M4q
spherical bump shape that is the bottom of the light guide. +# A|Zp<
You might be curious as to why you cannot see the 3D texture property zones you _qdW QFuM
defined. They are invisible by default, because drawing thousands of texture HM;4=%
elements can make displaying and exploring the model somewhat slow. If you ZO]E@?Oav
choose to make them visible, 3D textures are displayed in wireframe, even if the -U&098}<K
display mode is set to translucent. Wireframe rendering displays a bit faster and _LL W{^V
shows more of the technical details. ggzAU6J
92 * LightTools Introductory Tutorial P[r}(@0rJ
%Gnd"SGs
HAPTER 5 Introduction to Backlight Design Ni/|C19Z
C 30:HRF( :
1.Rotate and zoom the model to that you can see something like the illustration t 4*aVHT
below: ..sJtA8
. k{!iDZr&f,
2.To reveal the Property Zones: iFXUKGiV
a.Right-click in the Design View and select View Preferences to display this =2Pz$q*ub
dialog box. :ga 9Db9P
b.On the Visibility tab, click the Property Zone check box to turn it on. N2 M?5fF
c.Click OK. ||bA
You will see the wire frame rendering of the spherical bumps on the ](idf ( j
bottom surface, and a solid color above it. The solid color is the 3D texture _
+u sn.
of the BEFs (brightness-enhancing films) built automatically by the utility.
