The default number of bumps is 100 (10 X 10). You need to change these ~B< \#oO
parameters to match your design. Note that LightTools allows many other 288mP]a(v_
placement options, but you will use the Bezier placement option for this &Vj @){
example. CKw-HgXG
5.On both the X Placement tab and Y Placement tab, change the Number of 97c0bgI!+
Bumps parameter to 300, as shown in the following figure. Click Apply after qw+ 7.h#V
each change. l@L k+-[D
6.Click OK to close the dialog box. l,n_G/\
Note that the number of bumps is 300 X 300, which results in about 90,000 /cS8@ )e4
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ]H`wE_2tu
manner defined by the Bezier parameterization option. Please see Chapter 5 of t/i*.>7
the LightTools Core Module User’s Guide for more information. With the St; 9&A
current parameter values, the Bezier option varies the bump spacing along the /X8a3Eqp9
length of the light guide. The spacing in the orthogonal direction is constant. 1I;q@g0
The X and Y refer to the local coordinate system of the surface. GzEw~JAs
LightTools Introductory Tutorial * 91 AA-$;s
5N9Cd[4
HAPTER 5 Introduction to Backlight Design R;"$ PH D
C q\tr&@4iC
Examining Surface Properties BDt$s(
\
Using the methods described in previous chapters, you may want to check your 2_$8Ga
model before you run a simulation. (4Db%Iw
Click on various parts of the model in the 3D Design View. Or use the System ;v8T T}R
Navigator to select different surfaces and view their Properties. 8;M,l2pmR{
1.In the System Navigator, click to open BottomSurface of the LightGuide, then e_-g|ukC
click Zones, and then click Texture. #kQ! GMZH
2.Select SphericalElement, and then right-click and select Properties from the R0M>'V ?e
shortcut menu. The Shape tab shows you a graphical representation of the x. t< @y~
spherical bump shape that is the bottom of the light guide. lB}?ey
You might be curious as to why you cannot see the 3D texture property zones you zDg* ds\
defined. They are invisible by default, because drawing thousands of texture R/u0,
elements can make displaying and exploring the model somewhat slow. If you 4n#u?)
choose to make them visible, 3D textures are displayed in wireframe, even if the : b9#e g
display mode is set to translucent. Wireframe rendering displays a bit faster and <v ub
Q4
shows more of the technical details. $y;w@^
92 * LightTools Introductory Tutorial s-#@t
_9oKW;7f7
HAPTER 5 Introduction to Backlight Design k r$)nf
C J
rK{MhO
1.Rotate and zoom the model to that you can see something like the illustration , ) :aU
below: !19T=p/:$
. 3 EAr=E]
2.To reveal the Property Zones: LBio$67F
a.Right-click in the Design View and select View Preferences to display this $%U}k=-
dialog box. /A5=L<T6F
b.On the Visibility tab, click the Property Zone check box to turn it on. 8y<mHJ[B
c.Click OK. UXZ3~/L5 O
You will see the wire frame rendering of the spherical bumps on the YBY;$&9
bottom surface, and a solid color above it. The solid color is the 3D texture 0ytAn+/"x
of the BEFs (brightness-enhancing films) built automatically by the utility.
