The default number of bumps is 100 (10 X 10). You need to change these ?Vo/mtbY5X
parameters to match your design. Note that LightTools allows many other qGhwbg
placement options, but you will use the Bezier placement option for this ?L(y8b}F (
example. C p!Qd e
5.On both the X Placement tab and Y Placement tab, change the Number of u0i;vO)MNt
Bumps parameter to 300, as shown in the following figure. Click Apply after Y<)9TU :D!
each change. CZ|h` ";P2
6.Click OK to close the dialog box. 2&KM&NX~
Note that the number of bumps is 300 X 300, which results in about 90,000 +WfO2V.
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a = 2R0 g2n
manner defined by the Bezier parameterization option. Please see Chapter 5 of ~7O.}RP0
the LightTools Core Module User’s Guide for more information. With the m5kt
O^EU
current parameter values, the Bezier option varies the bump spacing along the K['Gp>l
length of the light guide. The spacing in the orthogonal direction is constant. #4wia% }u
The X and Y refer to the local coordinate system of the surface. ,4Qct=%L_
LightTools Introductory Tutorial * 91 V:>ZSW4,^
K;P<c,9X/
HAPTER 5 Introduction to Backlight Design ^/:G` '
C OqlP_^Zz7p
Examining Surface Properties V}p o
Using the methods described in previous chapters, you may want to check your ;Vlt4,s)
model before you run a simulation. y#?AW`|
Click on various parts of the model in the 3D Design View. Or use the System $I4:g.gKpG
Navigator to select different surfaces and view their Properties. vfpK|=[7o
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Ns5'K^
click Zones, and then click Texture. \\v1 \
2.Select SphericalElement, and then right-click and select Properties from the i_ z4;%#?
shortcut menu. The Shape tab shows you a graphical representation of the AB[#
spherical bump shape that is the bottom of the light guide. wpV)y Q^
You might be curious as to why you cannot see the 3D texture property zones you U#' WP
defined. They are invisible by default, because drawing thousands of texture V)#rP ?Y
elements can make displaying and exploring the model somewhat slow. If you =P7!6V\f
choose to make them visible, 3D textures are displayed in wireframe, even if the %Z!3[.%F
display mode is set to translucent. Wireframe rendering displays a bit faster and |N%#;7
shows more of the technical details. @zq]vX-A_
92 * LightTools Introductory Tutorial | \ 6Ff/O
&+Yoob]P
HAPTER 5 Introduction to Backlight Design ty-erdsP
C E`gUNAKQ
1.Rotate and zoom the model to that you can see something like the illustration XTS%:S
below: #J|DW C!#d
. [z> Ya-uz7
2.To reveal the Property Zones: q-R'5p\C?|
a.Right-click in the Design View and select View Preferences to display this "fZWAGDBO\
dialog box. ~%Xs"R1c ,
b.On the Visibility tab, click the Property Zone check box to turn it on. xQ ~N1Y2W
c.Click OK. ^rssZQK Y[
You will see the wire frame rendering of the spherical bumps on the dH_g:ocA
bottom surface, and a solid color above it. The solid color is the 3D texture kCvf-;b
of the BEFs (brightness-enhancing films) built automatically by the utility.
