The default number of bumps is 100 (10 X 10). You need to change these /RWD\u<l
parameters to match your design. Note that LightTools allows many other r,: acK
placement options, but you will use the Bezier placement option for this ~G. MaSm
example. (g1Op~EM
5.On both the X Placement tab and Y Placement tab, change the Number of `w)yR>lqh
Bumps parameter to 300, as shown in the following figure. Click Apply after *Xh#W7,<
each change. zd {sw}
6.Click OK to close the dialog box. 7/)0{B4U'
Note that the number of bumps is 300 X 300, which results in about 90,000 1yFIIj:^|
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a |fo#pwX
manner defined by the Bezier parameterization option. Please see Chapter 5 of ``>z8t[ks
the LightTools Core Module User’s Guide for more information. With the C(M ?$s `
current parameter values, the Bezier option varies the bump spacing along the (&X/ n=UI
length of the light guide. The spacing in the orthogonal direction is constant. \$gA2r
The X and Y refer to the local coordinate system of the surface. Qm_;o(
LightTools Introductory Tutorial * 91 .fS{j$
i9T<(sdK+
HAPTER 5 Introduction to Backlight Design {e0(M*u
C $Z8riVJ7j-
Examining Surface Properties ^UFNds'q
Using the methods described in previous chapters, you may want to check your .9UrWBW\I
model before you run a simulation. ] 2A2<Q_,
Click on various parts of the model in the 3D Design View. Or use the System U
U#tm
Navigator to select different surfaces and view their Properties. sH]T1z
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ,V{Bpr
click Zones, and then click Texture. }nSu7)3$B
2.Select SphericalElement, and then right-click and select Properties from the ~(:0&w%e
shortcut menu. The Shape tab shows you a graphical representation of the s|X_:3\x
spherical bump shape that is the bottom of the light guide. _9?v?mL5;
You might be curious as to why you cannot see the 3D texture property zones you \+:`nz3m
defined. They are invisible by default, because drawing thousands of texture x{/-&`F
elements can make displaying and exploring the model somewhat slow. If you ]@ }o"Td
choose to make them visible, 3D textures are displayed in wireframe, even if the ^)h &s*
display mode is set to translucent. Wireframe rendering displays a bit faster and j3u!lZ}U
shows more of the technical details. b*4aUpW
92 * LightTools Introductory Tutorial +-|}<mq
Y=y
0`?K
HAPTER 5 Introduction to Backlight Design {Z178sik
C b~(S;1NS'
1.Rotate and zoom the model to that you can see something like the illustration IYa(B+n B)
below: ,$RXN8x1
. _rz\[{)
2.To reveal the Property Zones: x 6^FpNgQ
a.Right-click in the Design View and select View Preferences to display this ?a'EkZ.dB
dialog box. :)h4SD8Y
b.On the Visibility tab, click the Property Zone check box to turn it on. ?[%.4i;-h
c.Click OK. Qh* }v!3Jo
You will see the wire frame rendering of the spherical bumps on the yV31OBC:
bottom surface, and a solid color above it. The solid color is the 3D texture BgY|v
[M&
of the BEFs (brightness-enhancing films) built automatically by the utility.
