The default number of bumps is 100 (10 X 10). You need to change these h yK&)y?~
parameters to match your design. Note that LightTools allows many other w;;9YFBdM
placement options, but you will use the Bezier placement option for this 2mEvoWnJ
example. h0a|R4J
5.On both the X Placement tab and Y Placement tab, change the Number of #ADm^UT ^
Bumps parameter to 300, as shown in the following figure. Click Apply after <NWq0 3:&
each change. ]p!)8[<
6.Click OK to close the dialog box. yQ0:M/r;0
Note that the number of bumps is 300 X 300, which results in about 90,000 -}( 2}~{e(
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 7>lM^ :A
manner defined by the Bezier parameterization option. Please see Chapter 5 of w)C5XX30;
the LightTools Core Module User’s Guide for more information. With the ?W2 u0N
current parameter values, the Bezier option varies the bump spacing along the ,49Z/P
length of the light guide. The spacing in the orthogonal direction is constant. {B-*w%}HU
The X and Y refer to the local coordinate system of the surface. h8dFW"cpC
LightTools Introductory Tutorial * 91 6= :s3I^
s }Ql9
HAPTER 5 Introduction to Backlight Design sGa}Cf;H@g
C 6n^@Ps
Examining Surface Properties u4j"U6"]M
Using the methods described in previous chapters, you may want to check your v UCmm<y
model before you run a simulation. 0j;q^>
Click on various parts of the model in the 3D Design View. Or use the System ocu,qL)W
Navigator to select different surfaces and view their Properties. $,P:B%]
1.In the System Navigator, click to open BottomSurface of the LightGuide, then dIfy!B"
click Zones, and then click Texture. ||?@pn\
2.Select SphericalElement, and then right-click and select Properties from the TJ1h[
shortcut menu. The Shape tab shows you a graphical representation of the Z&O6<=bg!
spherical bump shape that is the bottom of the light guide. @fb"G4o`:
You might be curious as to why you cannot see the 3D texture property zones you | kP utB
defined. They are invisible by default, because drawing thousands of texture s VHk;:e>x
elements can make displaying and exploring the model somewhat slow. If you 0( *L)s,5
choose to make them visible, 3D textures are displayed in wireframe, even if the qV6WT&)T
display mode is set to translucent. Wireframe rendering displays a bit faster and ^=5x1<a9$
shows more of the technical details. L$BV`JWPw
92 * LightTools Introductory Tutorial :AS`1\ C
<Se9 aD
HAPTER 5 Introduction to Backlight Design X8">DR&>Y
C }opw_h+/F
1.Rotate and zoom the model to that you can see something like the illustration G:p85k `
below: nwh @F1|
. H>A6V Du
2.To reveal the Property Zones: B0%=! &
a.Right-click in the Design View and select View Preferences to display this "i\#L`TkzX
dialog box. |-G2 pu;
b.On the Visibility tab, click the Property Zone check box to turn it on. |/vJ+aKq
c.Click OK. oFf9KHorW
You will see the wire frame rendering of the spherical bumps on the Id##367R
bottom surface, and a solid color above it. The solid color is the 3D texture 8l L |j
of the BEFs (brightness-enhancing films) built automatically by the utility.
