The default number of bumps is 100 (10 X 10). You need to change these Z 0:2x(x9
parameters to match your design. Note that LightTools allows many other l=oVC6C
placement options, but you will use the Bezier placement option for this ~;+vF-]R
example. e%P;Jj476
5.On both the X Placement tab and Y Placement tab, change the Number of 7m jj%
Bumps parameter to 300, as shown in the following figure. Click Apply after d#*5U9\z
each change. zm:=d>D..
6.Click OK to close the dialog box. 4A&e+kz&:R
Note that the number of bumps is 300 X 300, which results in about 90,000 !G,$:t1-=V
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a R',w~1RV'
manner defined by the Bezier parameterization option. Please see Chapter 5 of I%&9`ceWY
the LightTools Core Module User’s Guide for more information. With the :}-u`K*
current parameter values, the Bezier option varies the bump spacing along the 0
mQ3P.9
length of the light guide. The spacing in the orthogonal direction is constant. w?*KO?K
The X and Y refer to the local coordinate system of the surface. yjO7/< 2
LightTools Introductory Tutorial * 91 KCF wO'
o
,!"E^
HAPTER 5 Introduction to Backlight Design %8 tN$8P
C [E^X=+Jnz
Examining Surface Properties $O>@ (K
Using the methods described in previous chapters, you may want to check your I Q L~I13
model before you run a simulation. ;Y '\:
Click on various parts of the model in the 3D Design View. Or use the System n96gDH*
Navigator to select different surfaces and view their Properties. q IT{` hX
1.In the System Navigator, click to open BottomSurface of the LightGuide, then :6/OU9f/R
click Zones, and then click Texture. z|<oxF.
2.Select SphericalElement, and then right-click and select Properties from the { Y"r]:5i
shortcut menu. The Shape tab shows you a graphical representation of the /$z@_U [L
spherical bump shape that is the bottom of the light guide. 6'ZnyWb
You might be curious as to why you cannot see the 3D texture property zones you &V3oW1*W
defined. They are invisible by default, because drawing thousands of texture of`]LU:
elements can make displaying and exploring the model somewhat slow. If you TxvPfU?
choose to make them visible, 3D textures are displayed in wireframe, even if the Fdw[CY Hz
display mode is set to translucent. Wireframe rendering displays a bit faster and FNM"!z
shows more of the technical details. >l1Yhxd_0*
92 * LightTools Introductory Tutorial h n|E <
T/;hIX:R
HAPTER 5 Introduction to Backlight Design \.a .'l
C nc~d*K\!
1.Rotate and zoom the model to that you can see something like the illustration ) R@gnTe
below: % 4"~O
_S
. 5Nb_K`Vp*
2.To reveal the Property Zones: PoJ yWC
a.Right-click in the Design View and select View Preferences to display this 5ecz'eA%
dialog box. g)A0PvEu
b.On the Visibility tab, click the Property Zone check box to turn it on. =.oW g uzu
c.Click OK. N^]>R :Stu
You will see the wire frame rendering of the spherical bumps on the KaE ;4gwM
bottom surface, and a solid color above it. The solid color is the 3D texture *`-29eR"8
of the BEFs (brightness-enhancing films) built automatically by the utility.
