The default number of bumps is 100 (10 X 10). You need to change these Hnc<)_DF
parameters to match your design. Note that LightTools allows many other My JG2C#R
placement options, but you will use the Bezier placement option for this ~Y'j8W
example. rLOdQN
5.On both the X Placement tab and Y Placement tab, change the Number of R3Ka^l8R|
Bumps parameter to 300, as shown in the following figure. Click Apply after F 5Fz T^
each change. (k&r^V/=
6.Click OK to close the dialog box. 4m3pF0k
Note that the number of bumps is 300 X 300, which results in about 90,000 52d8EGC
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a mY !LGN
manner defined by the Bezier parameterization option. Please see Chapter 5 of O\KSPy7YQ
the LightTools Core Module User’s Guide for more information. With the *;y n_zg
current parameter values, the Bezier option varies the bump spacing along the hz~jyH.h_
length of the light guide. The spacing in the orthogonal direction is constant. LX_{39?<{
The X and Y refer to the local coordinate system of the surface. bjYaJ tn
LightTools Introductory Tutorial * 91 2%(RB 4+
=Frbhh57
HAPTER 5 Introduction to Backlight Design o:"^@3
C j: /cJt
Examining Surface Properties !_SIq`5]@
Using the methods described in previous chapters, you may want to check your 58H%#3Fy
model before you run a simulation. +F3`?6UXz
Click on various parts of the model in the 3D Design View. Or use the System kw.I Vz<
Navigator to select different surfaces and view their Properties. }MV=I$S2U
1.In the System Navigator, click to open BottomSurface of the LightGuide, then R x.]m0
click Zones, and then click Texture. a#G]5T Z
2.Select SphericalElement, and then right-click and select Properties from the -!b@\=
shortcut menu. The Shape tab shows you a graphical representation of the A T'P=)F@
spherical bump shape that is the bottom of the light guide. %1jApCJ
You might be curious as to why you cannot see the 3D texture property zones you EU"J '?
defined. They are invisible by default, because drawing thousands of texture iu(+
N~
elements can make displaying and exploring the model somewhat slow. If you b &1-tYV
choose to make them visible, 3D textures are displayed in wireframe, even if the j}$Up7pW
display mode is set to translucent. Wireframe rendering displays a bit faster and ~ok i s
shows more of the technical details. :[ A P^
92 * LightTools Introductory Tutorial Ee?+IZ H7|
dn)pVti _
HAPTER 5 Introduction to Backlight Design
?Ok@1
C XU19+mW=P
1.Rotate and zoom the model to that you can see something like the illustration | U4t 8
below:
5pI=K/-
. ';0NWFP
2.To reveal the Property Zones: R1=ir# U|D
a.Right-click in the Design View and select View Preferences to display this - d8||X[
dialog box. Ud8*yB
b.On the Visibility tab, click the Property Zone check box to turn it on. (66DKG
c.Click OK. p /f!\
You will see the wire frame rendering of the spherical bumps on the 6Y[|xu:N8Y
bottom surface, and a solid color above it. The solid color is the 3D texture AZTn!hrU
of the BEFs (brightness-enhancing films) built automatically by the utility.
