The default number of bumps is 100 (10 X 10). You need to change these :dj=kuUTbu
parameters to match your design. Note that LightTools allows many other W#lt_2!j
placement options, but you will use the Bezier placement option for this rEG!A87Zz
example. =E4~/F}9/T
5.On both the X Placement tab and Y Placement tab, change the Number of EK<ly"S.
Bumps parameter to 300, as shown in the following figure. Click Apply after 37nGFH`K2m
each change. $>!t pJw
6.Click OK to close the dialog box. 1n| K
Note that the number of bumps is 300 X 300, which results in about 90,000 %8~g#Z
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 7=[/J*-m
manner defined by the Bezier parameterization option. Please see Chapter 5 of Onj)AJ9M0r
the LightTools Core Module User’s Guide for more information. With the d2[R{eNX=
current parameter values, the Bezier option varies the bump spacing along the |;MW98 A
length of the light guide. The spacing in the orthogonal direction is constant. 4'BZ +A,p
The X and Y refer to the local coordinate system of the surface. "?#O *x
LightTools Introductory Tutorial * 91 #5 }v ?
g.d~`R @v
HAPTER 5 Introduction to Backlight Design L|A.;Gq
C l fJ
lXD
Examining Surface Properties {;E]#=|
Using the methods described in previous chapters, you may want to check your }D7} %P]
model before you run a simulation. dId&tTMmC
Click on various parts of the model in the 3D Design View. Or use the System >}'WL($5U
Navigator to select different surfaces and view their Properties. 66%4p%#b4
1.In the System Navigator, click to open BottomSurface of the LightGuide, then U<jAZU[L
click Zones, and then click Texture. &n-)A lx
2.Select SphericalElement, and then right-click and select Properties from the %Tm8sQ)1
shortcut menu. The Shape tab shows you a graphical representation of the CwQRHi
spherical bump shape that is the bottom of the light guide. BNpc-O~
You might be curious as to why you cannot see the 3D texture property zones you y pV> *
defined. They are invisible by default, because drawing thousands of texture 6UnWtLE
elements can make displaying and exploring the model somewhat slow. If you 2(i v+<t
choose to make them visible, 3D textures are displayed in wireframe, even if the ] R-<v&O
display mode is set to translucent. Wireframe rendering displays a bit faster and 6;{E -y
shows more of the technical details. N,~ "8YSo
92 * LightTools Introductory Tutorial [[gfR'79{
O) ?
HAPTER 5 Introduction to Backlight Design 3}25=% ;[
C >P[BwL]
1.Rotate and zoom the model to that you can see something like the illustration F=l. 2t*9
below: Kb,#Ot
. 2"C,u V@F!
2.To reveal the Property Zones: 6V^KOG
a.Right-click in the Design View and select View Preferences to display this , J Z M%f
dialog box. 'ghwc:Og|%
b.On the Visibility tab, click the Property Zone check box to turn it on. {H[3[
c.Click OK. sm96Ye{O{
You will see the wire frame rendering of the spherical bumps on the T, SCK^
bottom surface, and a solid color above it. The solid color is the 3D texture )3A%Un#B
of the BEFs (brightness-enhancing films) built automatically by the utility.
