The default number of bumps is 100 (10 X 10). You need to change these c>,|[zP{
parameters to match your design. Note that LightTools allows many other 2*ZB[ 5_V
placement options, but you will use the Bezier placement option for this g k1I1)p
example. j:0(=H!#
5.On both the X Placement tab and Y Placement tab, change the Number of eZ8~t/8
Bumps parameter to 300, as shown in the following figure. Click Apply after [f!sBJ!
each change. G n>#Mvq
6.Click OK to close the dialog box. g!,>.
Note that the number of bumps is 300 X 300, which results in about 90,000 NffZttN
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a VK5| w:
manner defined by the Bezier parameterization option. Please see Chapter 5 of 'P3CgpF<Z2
the LightTools Core Module User’s Guide for more information. With the -NGY+1
current parameter values, the Bezier option varies the bump spacing along the 3){ /u$iH.
length of the light guide. The spacing in the orthogonal direction is constant. /\q1,}M
The X and Y refer to the local coordinate system of the surface. ]X ,f
LightTools Introductory Tutorial * 91 /4}{SE
}lvD 5
HAPTER 5 Introduction to Backlight Design 1\X1G>60m
C 0O5(\8jM
Examining Surface Properties _3i.o$ GO
Using the methods described in previous chapters, you may want to check your ZaIlo5
model before you run a simulation. c!{v/zOz
Click on various parts of the model in the 3D Design View. Or use the System ?ey!wcv~
Navigator to select different surfaces and view their Properties. [7]Kvb2t
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 3C =ON.1eg
click Zones, and then click Texture. QVA)&k'T,
2.Select SphericalElement, and then right-click and select Properties from the z UF%`CR
shortcut menu. The Shape tab shows you a graphical representation of the 5xtIez]x?
spherical bump shape that is the bottom of the light guide. _ +q. R
You might be curious as to why you cannot see the 3D texture property zones you #
xx{}g]%
defined. They are invisible by default, because drawing thousands of texture WqlX'tA
elements can make displaying and exploring the model somewhat slow. If you = Bz yI
choose to make them visible, 3D textures are displayed in wireframe, even if the ?nZQTO 7
display mode is set to translucent. Wireframe rendering displays a bit faster and 16Ym*kWIps
shows more of the technical details. ~ M 7
J{hK
92 * LightTools Introductory Tutorial + KGZk?%
M@ t,P?
HAPTER 5 Introduction to Backlight Design o&g- 0!"
C 5v<X-8"
1.Rotate and zoom the model to that you can see something like the illustration mltG4R
?
below: ,Wtod|vx\U
. lv\C(^mGq
2.To reveal the Property Zones: vs]# ?3+
a.Right-click in the Design View and select View Preferences to display this WP{ !|d&
dialog box. u2%/</]h
b.On the Visibility tab, click the Property Zone check box to turn it on. -L<''2t
c.Click OK. f4eLnY
You will see the wire frame rendering of the spherical bumps on the /G[; kR"
bottom surface, and a solid color above it. The solid color is the 3D texture %P05 k
of the BEFs (brightness-enhancing films) built automatically by the utility.
