The default number of bumps is 100 (10 X 10). You need to change these 3._fb AN%e
parameters to match your design. Note that LightTools allows many other GW#Wy=(_
placement options, but you will use the Bezier placement option for this pj`-T"Q
example. +g&W 423k_
5.On both the X Placement tab and Y Placement tab, change the Number of Mf"B!WU>]B
Bumps parameter to 300, as shown in the following figure. Click Apply after )i>KgX
each change. 4B
6Aw?
6.Click OK to close the dialog box. 8X5XwFf}
Note that the number of bumps is 300 X 300, which results in about 90,000 ,GlK_-6>
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a =nl,5^
manner defined by the Bezier parameterization option. Please see Chapter 5 of J!>oC_0]8
the LightTools Core Module User’s Guide for more information. With the a gz G
current parameter values, the Bezier option varies the bump spacing along the {I
,'
length of the light guide. The spacing in the orthogonal direction is constant. kzT'
The X and Y refer to the local coordinate system of the surface. i)ctrdP-
LightTools Introductory Tutorial * 91 ,\ i q'}i
V8/o@I{U[
HAPTER 5 Introduction to Backlight Design !ywc). ]e
C |i I`p-L9
Examining Surface Properties t+tGN \q
Using the methods described in previous chapters, you may want to check your /r6DPR0\
model before you run a simulation. hb{(r@[WHv
Click on various parts of the model in the 3D Design View. Or use the System 195(Kr<5$
Navigator to select different surfaces and view their Properties. fi)ypv*
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Yv)/DsSyL
click Zones, and then click Texture. eAj}/2y"
2.Select SphericalElement, and then right-click and select Properties from the YL+W 4 ld
shortcut menu. The Shape tab shows you a graphical representation of the 4$rO,W/&0
spherical bump shape that is the bottom of the light guide. 'n=D$j]X
You might be curious as to why you cannot see the 3D texture property zones you '1 + Bgf
defined. They are invisible by default, because drawing thousands of texture pI4<`
K
elements can make displaying and exploring the model somewhat slow. If you gQ[4{+DSf
choose to make them visible, 3D textures are displayed in wireframe, even if the "x)W 3C%*S
display mode is set to translucent. Wireframe rendering displays a bit faster and *4bV8T>0Z
shows more of the technical details. l`k3!EZDS
92 * LightTools Introductory Tutorial //(c 1/s
(~#9KA1A}
HAPTER 5 Introduction to Backlight Design G(-
`FH
C 9b0Z
Ey{
1.Rotate and zoom the model to that you can see something like the illustration 9/Ls3U?
below: &}oDSD
H^,
. Gu-Sv!4p
2.To reveal the Property Zones: N78Ev7PN
a.Right-click in the Design View and select View Preferences to display this #{(rOb6H)
dialog box. [3s~Z8
pP
b.On the Visibility tab, click the Property Zone check box to turn it on. p5*Y&aKj
c.Click OK. Je'$V%{E
You will see the wire frame rendering of the spherical bumps on the 8`D_"3j3g\
bottom surface, and a solid color above it. The solid color is the 3D texture Z7Kc`9.0|
of the BEFs (brightness-enhancing films) built automatically by the utility.
