The default number of bumps is 100 (10 X 10). You need to change these )F\^-laMuK
parameters to match your design. Note that LightTools allows many other ;u hpo
placement options, but you will use the Bezier placement option for this mD_sf_ 2>
example. UfNcI[xr
5.On both the X Placement tab and Y Placement tab, change the Number of "<$JU@P
Bumps parameter to 300, as shown in the following figure. Click Apply after Ywo=w:'
each change. !CUy{nV
6.Click OK to close the dialog box. *v:o`{vM[
Note that the number of bumps is 300 X 300, which results in about 90,000 f{w[H S,z
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a @#>YU
manner defined by the Bezier parameterization option. Please see Chapter 5 of peZ'sZ 6
the LightTools Core Module User’s Guide for more information. With the *JA0Vs 5
current parameter values, the Bezier option varies the bump spacing along the G@4n]c_
length of the light guide. The spacing in the orthogonal direction is constant. )~{8C:
The X and Y refer to the local coordinate system of the surface. l|S_10x5
LightTools Introductory Tutorial * 91 Ru~;awV?
vW Z?*0^
HAPTER 5 Introduction to Backlight Design nhLw &V3y
C h @2.D|c)g
Examining Surface Properties O|mWQp^?q
Using the methods described in previous chapters, you may want to check your q71V]!
model before you run a simulation. tL\L4>^7T
Click on various parts of the model in the 3D Design View. Or use the System P_F0lO
Navigator to select different surfaces and view their Properties. p7p6 ~;P
1.In the System Navigator, click to open BottomSurface of the LightGuide, then /pt G
click Zones, and then click Texture. (r-8*)Qh8
2.Select SphericalElement, and then right-click and select Properties from the v VF T0_
shortcut menu. The Shape tab shows you a graphical representation of the IWT
-)+
spherical bump shape that is the bottom of the light guide.
D}/nE>*
You might be curious as to why you cannot see the 3D texture property zones you n%d7`?tm4
defined. They are invisible by default, because drawing thousands of texture lbj_ if;
elements can make displaying and exploring the model somewhat slow. If you |H'wDw8
choose to make them visible, 3D textures are displayed in wireframe, even if the &9 khIJI n
display mode is set to translucent. Wireframe rendering displays a bit faster and )5 ev4Qf
shows more of the technical details. d:g0XP
92 * LightTools Introductory Tutorial h/NI5
ZJ%iiY
HAPTER 5 Introduction to Backlight Design -uhg7N[3
C Q[&C tM
1.Rotate and zoom the model to that you can see something like the illustration /& o<kY
below: =p \eh?^
. Gxw>.O){
2.To reveal the Property Zones: Ih%LKFT
a.Right-click in the Design View and select View Preferences to display this M!O &\2Q
dialog box. =PmIrvr'[5
b.On the Visibility tab, click the Property Zone check box to turn it on. ,F?O} ijk
c.Click OK. 3z!^UA>q
You will see the wire frame rendering of the spherical bumps on the rd s0EZ4 W
bottom surface, and a solid color above it. The solid color is the 3D texture 4E p6vm X
of the BEFs (brightness-enhancing films) built automatically by the utility.
