The default number of bumps is 100 (10 X 10). You need to change these rX{|]M":T
parameters to match your design. Note that LightTools allows many other p Y>yJ)
placement options, but you will use the Bezier placement option for this @ #X zk?+
example. !^ "hYp`
5.On both the X Placement tab and Y Placement tab, change the Number of A<.Q&4jb
Bumps parameter to 300, as shown in the following figure. Click Apply after ] &G5/ ]f
each change. :Dr&
{3>
6.Click OK to close the dialog box. ^~`8 - TE
Note that the number of bumps is 300 X 300, which results in about 90,000 :sPku<1is
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a *10e)rzM
manner defined by the Bezier parameterization option. Please see Chapter 5 of =v;-{o N!
the LightTools Core Module User’s Guide for more information. With the Z(}x7j zW
current parameter values, the Bezier option varies the bump spacing along the WVN Q} KY
length of the light guide. The spacing in the orthogonal direction is constant. nev*TYY?A
The X and Y refer to the local coordinate system of the surface. v\MH;DW^Z
LightTools Introductory Tutorial * 91
HK[sHB&
v" F0 $c
HAPTER 5 Introduction to Backlight Design dl":?D4H
C $Jr`4s
Examining Surface Properties ka>RAr J
Using the methods described in previous chapters, you may want to check your ~y|%D;
model before you run a simulation. MZd\.]G@
Click on various parts of the model in the 3D Design View. Or use the System I8Zp#'|U
Navigator to select different surfaces and view their Properties. yh0|f94m
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 4
^+hw ;
click Zones, and then click Texture. uRL3v01?H0
2.Select SphericalElement, and then right-click and select Properties from the \
qs6%
shortcut menu. The Shape tab shows you a graphical representation of the >6kWmXK[
spherical bump shape that is the bottom of the light guide. 1I@4xC
#X
You might be curious as to why you cannot see the 3D texture property zones you I Mv^ 9T:
defined. They are invisible by default, because drawing thousands of texture SY$%!!
@R
elements can make displaying and exploring the model somewhat slow. If you =6W:O
choose to make them visible, 3D textures are displayed in wireframe, even if the zPw
R1> gL
display mode is set to translucent. Wireframe rendering displays a bit faster and {!/y@/NK2
shows more of the technical details. O\D({>
92 * LightTools Introductory Tutorial eLC&f}
G1n W{vce
HAPTER 5 Introduction to Backlight Design y\S7oD(OR
C X sG]-Cw
1.Rotate and zoom the model to that you can see something like the illustration Gqia@>T4*N
below: AngECkF-
. KOmP-q=6
2.To reveal the Property Zones: |v1 K@
a.Right-click in the Design View and select View Preferences to display this | 5L1\O8#
dialog box. HJ'93,
b.On the Visibility tab, click the Property Zone check box to turn it on. a sq/_`
c.Click OK. -E500F*b
You will see the wire frame rendering of the spherical bumps on the I+CQ,Zuf
bottom surface, and a solid color above it. The solid color is the 3D texture pS<b|wu?f
of the BEFs (brightness-enhancing films) built automatically by the utility.
