The default number of bumps is 100 (10 X 10). You need to change these 93[`1_q7\
parameters to match your design. Note that LightTools allows many other N[dh NK"
placement options, but you will use the Bezier placement option for this kf&id/|
example. $?wX*
5.On both the X Placement tab and Y Placement tab, change the Number of :m@(S6T m
Bumps parameter to 300, as shown in the following figure. Click Apply after 4'G<qJo c
each change. Woe sE:NiR
6.Click OK to close the dialog box. v\$XhO K
Note that the number of bumps is 300 X 300, which results in about 90,000 oA_AnD?G+
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a AkT_ZU>
manner defined by the Bezier parameterization option. Please see Chapter 5 of vA(3H/)-
the LightTools Core Module User’s Guide for more information. With the A -c3B+
current parameter values, the Bezier option varies the bump spacing along the DV{Qbe#I n
length of the light guide. The spacing in the orthogonal direction is constant. *Fp )/Ih
The X and Y refer to the local coordinate system of the surface. pz.<5
LightTools Introductory Tutorial * 91 {#Mz4s`M
1u)I}"{W>
HAPTER 5 Introduction to Backlight Design T"d Wr tO
C V"T;3@N/4
Examining Surface Properties V..m2nQj
Using the methods described in previous chapters, you may want to check your |]\qI
model before you run a simulation. {jggiMwo.v
Click on various parts of the model in the 3D Design View. Or use the System d=H C;T)
Navigator to select different surfaces and view their Properties. :+!hR4Z~\;
1.In the System Navigator, click to open BottomSurface of the LightGuide, then F-UY~i8
click Zones, and then click Texture. zx0{cNPK 5
2.Select SphericalElement, and then right-click and select Properties from the w9i1ag
shortcut menu. The Shape tab shows you a graphical representation of the ]>*Z 1g;
spherical bump shape that is the bottom of the light guide. :mY(d6#A>
You might be curious as to why you cannot see the 3D texture property zones you \u",bMQF
defined. They are invisible by default, because drawing thousands of texture +4B >gS[ F
elements can make displaying and exploring the model somewhat slow. If you !mq+Oz~
choose to make them visible, 3D textures are displayed in wireframe, even if the w9c
display mode is set to translucent. Wireframe rendering displays a bit faster and DFqXZfjm
shows more of the technical details. L!-T`R8'c
92 * LightTools Introductory Tutorial "m/0>UU0
xjv?Z" X
HAPTER 5 Introduction to Backlight Design j
YO #
C bWjW_$8
1.Rotate and zoom the model to that you can see something like the illustration -zG/@.
below: won%(n,HT
. !63x^# kg
2.To reveal the Property Zones: A!goR-J]
a.Right-click in the Design View and select View Preferences to display this Gi Zy C
dialog box. q$>At} 4
b.On the Visibility tab, click the Property Zone check box to turn it on. /':kJOk<[
c.Click OK. F9-xp7 T
You will see the wire frame rendering of the spherical bumps on the S%g` X
bottom surface, and a solid color above it. The solid color is the 3D texture 6W#M[0
of the BEFs (brightness-enhancing films) built automatically by the utility.
