The default number of bumps is 100 (10 X 10). You need to change these ;Wrd=)Ka
parameters to match your design. Note that LightTools allows many other d7-F&!sQ
placement options, but you will use the Bezier placement option for this <8 12V8<!
example. {D2d({7
5.On both the X Placement tab and Y Placement tab, change the Number of C` 1\ $U~%
Bumps parameter to 300, as shown in the following figure. Click Apply after ~zOU/8n
,F
each change. TXk"[>,:H
6.Click OK to close the dialog box. fS$Yl ~-m?
Note that the number of bumps is 300 X 300, which results in about 90,000 pcxl2I
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a O [ ; 6E
manner defined by the Bezier parameterization option. Please see Chapter 5 of >, Swk3
the LightTools Core Module User’s Guide for more information. With the E6&uZr
current parameter values, the Bezier option varies the bump spacing along the ABYW 1K=
length of the light guide. The spacing in the orthogonal direction is constant. c.me1fGn
The X and Y refer to the local coordinate system of the surface. `9"jHw`D
LightTools Introductory Tutorial * 91 !\|@{UJk/
Z_ *ZUN?B
HAPTER 5 Introduction to Backlight Design * jNu?$
C ne~# { q
Examining Surface Properties %KVR iX
Using the methods described in previous chapters, you may want to check your Q ]koj!mMl
model before you run a simulation. 9lwo /(s
Click on various parts of the model in the 3D Design View. Or use the System HBkQ`T
Navigator to select different surfaces and view their Properties. #( }_2x5
1.In the System Navigator, click to open BottomSurface of the LightGuide, then g8@i_
click Zones, and then click Texture. g=' 2~c
2.Select SphericalElement, and then right-click and select Properties from the WRyv
>Y
shortcut menu. The Shape tab shows you a graphical representation of the KB-#):'
spherical bump shape that is the bottom of the light guide. =|t1eSzc
You might be curious as to why you cannot see the 3D texture property zones you Vblf6 qaBs
defined. They are invisible by default, because drawing thousands of texture |P?B AWYeQ
elements can make displaying and exploring the model somewhat slow. If you # 2t\>7]
choose to make them visible, 3D textures are displayed in wireframe, even if the B!C32~[
display mode is set to translucent. Wireframe rendering displays a bit faster and Qz90 mb
shows more of the technical details. |8?{JKsg
92 * LightTools Introductory Tutorial ?=o]Wx0(9
o\YdL2:X
HAPTER 5 Introduction to Backlight Design w0>)y -
C ' `VO@a
1.Rotate and zoom the model to that you can see something like the illustration ^Q+5M"/8
below: B'~i Z65
. L7'X7WYf&
2.To reveal the Property Zones: GnHf9
J rR
a.Right-click in the Design View and select View Preferences to display this ll^O+>1dO
dialog box. 4>eg@s N
b.On the Visibility tab, click the Property Zone check box to turn it on. AyXKhj#Ml
c.Click OK. !LSWg:Ev+
You will see the wire frame rendering of the spherical bumps on the 6E% k{ r
bottom surface, and a solid color above it. The solid color is the 3D texture TgG)btQ
of the BEFs (brightness-enhancing films) built automatically by the utility.
