The default number of bumps is 100 (10 X 10). You need to change these kmX9)TMVO
parameters to match your design. Note that LightTools allows many other |9=A"092{
placement options, but you will use the Bezier placement option for this \pfa\, rW
example. q&J5(9]O|L
5.On both the X Placement tab and Y Placement tab, change the Number of #>("(euXMF
Bumps parameter to 300, as shown in the following figure. Click Apply after yvj /u
c
each change. ]J'TebP=L5
6.Click OK to close the dialog box. IdN3Ea]
Note that the number of bumps is 300 X 300, which results in about 90,000 rJkJ/9s
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a z=) m6\
manner defined by the Bezier parameterization option. Please see Chapter 5 of Ak,JPz T
the LightTools Core Module User’s Guide for more information. With the (Hj [9[=
current parameter values, the Bezier option varies the bump spacing along the A&)2m
length of the light guide. The spacing in the orthogonal direction is constant. Zp3-Yo w2
The X and Y refer to the local coordinate system of the surface. v@tEHRadz
LightTools Introductory Tutorial * 91 !p).3 Kx0
| T$?vIG[
HAPTER 5 Introduction to Backlight Design E r%&y
C w2UEU5%
Examining Surface Properties RrvC}9ar
Using the methods described in previous chapters, you may want to check your ` (h^z>%
model before you run a simulation. ^!\AT!OT
Click on various parts of the model in the 3D Design View. Or use the System 38D5vT)n
Navigator to select different surfaces and view their Properties. ~ HhB@G!3
1.In the System Navigator, click to open BottomSurface of the LightGuide, then tiE|%jOzt
click Zones, and then click Texture. +^+'. xQ
2.Select SphericalElement, and then right-click and select Properties from the Y|Q(JX
shortcut menu. The Shape tab shows you a graphical representation of the Lv]%P.=[G
spherical bump shape that is the bottom of the light guide. a`n)aXU l
You might be curious as to why you cannot see the 3D texture property zones you N-?5 [T"
defined. They are invisible by default, because drawing thousands of texture 4pf@.ra,
elements can make displaying and exploring the model somewhat slow. If you O*GF/ R8B
choose to make them visible, 3D textures are displayed in wireframe, even if the 4r7F8*z
display mode is set to translucent. Wireframe rendering displays a bit faster and Jh 0Grq
shows more of the technical details. G(.G>8pf
92 * LightTools Introductory Tutorial D$ K'Qk
#WSqh +
HAPTER 5 Introduction to Backlight Design qvSYrnpn
C ;W|NG3_y
1.Rotate and zoom the model to that you can see something like the illustration cJaA *sg
below: pT->qQ3;
. ; 7qIm83
2.To reveal the Property Zones: !(F?`([A
a.Right-click in the Design View and select View Preferences to display this d/
^IL*O
dialog box. Hs '~) T
b.On the Visibility tab, click the Property Zone check box to turn it on. mdEJ'];AH
c.Click OK. t_jn-Idcf
You will see the wire frame rendering of the spherical bumps on the HTT&T9]
bottom surface, and a solid color above it. The solid color is the 3D texture :vb5J33U
of the BEFs (brightness-enhancing films) built automatically by the utility.
