The default number of bumps is 100 (10 X 10). You need to change these P Q{5*}$N
parameters to match your design. Note that LightTools allows many other N@Q_5t0bk
placement options, but you will use the Bezier placement option for this =!G{+&j
example. ^zW=s$\Fo
5.On both the X Placement tab and Y Placement tab, change the Number of #-o 'g!
Bumps parameter to 300, as shown in the following figure. Click Apply after /Pxny3
each change. V%B~ q`4
6.Click OK to close the dialog box. h\2iArw8
Note that the number of bumps is 300 X 300, which results in about 90,000 [FZq'E"87
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 4 hxa|f
manner defined by the Bezier parameterization option. Please see Chapter 5 of ^H -a@QM
the LightTools Core Module User’s Guide for more information. With the phQ{<wzwp
current parameter values, the Bezier option varies the bump spacing along the +4Fw13ADE
length of the light guide. The spacing in the orthogonal direction is constant. EywBT
The X and Y refer to the local coordinate system of the surface. J0imWluhQ
LightTools Introductory Tutorial * 91 >?#zPweA
K)
Ums-b
HAPTER 5 Introduction to Backlight Design A+j!VM
C eL<jA9cJ9
Examining Surface Properties 7X)4ec9H\
Using the methods described in previous chapters, you may want to check your =ym<yI<
model before you run a simulation. w:/3% -
Click on various parts of the model in the 3D Design View. Or use the System
_Ie:!q
Navigator to select different surfaces and view their Properties. d0i| ^
1.In the System Navigator, click to open BottomSurface of the LightGuide, then n wMq~I*1
click Zones, and then click Texture. S>)[n]f
2.Select SphericalElement, and then right-click and select Properties from the +&dkJ 4g[
shortcut menu. The Shape tab shows you a graphical representation of the ddN G :
spherical bump shape that is the bottom of the light guide. do*a E
You might be curious as to why you cannot see the 3D texture property zones you :[CEHRc7x
defined. They are invisible by default, because drawing thousands of texture *U}ztH-+/
elements can make displaying and exploring the model somewhat slow. If you VkO*+"cGv
choose to make them visible, 3D textures are displayed in wireframe, even if the (L1F ],Au
display mode is set to translucent. Wireframe rendering displays a bit faster and $}'(%\7"
shows more of the technical details. !iq|sXs
92 * LightTools Introductory Tutorial V/: 2x T
nW}
s
HAPTER 5 Introduction to Backlight Design $$uMu{?0i
C 2[;~@n1 P
1.Rotate and zoom the model to that you can see something like the illustration kv6nVlI)B
below: 0OQ*V~>f
. n @,.
2.To reveal the Property Zones: cRuN;
a.Right-click in the Design View and select View Preferences to display this w0+X;aI d
dialog box. B=$O4nW_b
b.On the Visibility tab, click the Property Zone check box to turn it on. A2;6Vz=z
c.Click OK. -SfU.XlZl
You will see the wire frame rendering of the spherical bumps on the b dLi _k
bottom surface, and a solid color above it. The solid color is the 3D texture L`e19I$
of the BEFs (brightness-enhancing films) built automatically by the utility.
