The default number of bumps is 100 (10 X 10). You need to change these (A?H1 9
parameters to match your design. Note that LightTools allows many other )~+ e`q
placement options, but you will use the Bezier placement option for this t7m>A-I
example. 9P~\Mpk
5.On both the X Placement tab and Y Placement tab, change the Number of >OG:vw)E
Bumps parameter to 300, as shown in the following figure. Click Apply after t@R
?Rgu3
each change. 8g:;)u4$P
6.Click OK to close the dialog box. ;B?DfWX
Note that the number of bumps is 300 X 300, which results in about 90,000 %c
[F;ug
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a L. EiO({W
manner defined by the Bezier parameterization option. Please see Chapter 5 of <HJl2p N
the LightTools Core Module User’s Guide for more information. With the 7G\\{
current parameter values, the Bezier option varies the bump spacing along the md q;R*`
length of the light guide. The spacing in the orthogonal direction is constant. '^Ql]% _
The X and Y refer to the local coordinate system of the surface. ??i,Vr@)w
LightTools Introductory Tutorial * 91 e?Ho a$k
EC\yz H*X
HAPTER 5 Introduction to Backlight Design 1xbK'i:-S
C ooV3gj4
Examining Surface Properties ^B@Wp
Using the methods described in previous chapters, you may want to check your *_KFW@bC:
model before you run a simulation. h-m \% |D
Click on various parts of the model in the 3D Design View. Or use the System :^fcC[$K
Navigator to select different surfaces and view their Properties. raCi 8
1.In the System Navigator, click to open BottomSurface of the LightGuide, then =Apxdnz,
click Zones, and then click Texture. Z0*ljT5 |
2.Select SphericalElement, and then right-click and select Properties from the BWM YpZom
shortcut menu. The Shape tab shows you a graphical representation of the {O,{ c\
spherical bump shape that is the bottom of the light guide. }j^\( 2
You might be curious as to why you cannot see the 3D texture property zones you a9T@$:
defined. They are invisible by default, because drawing thousands of texture Wa1,
p
elements can make displaying and exploring the model somewhat slow. If you `"@g8PWe
choose to make them visible, 3D textures are displayed in wireframe, even if the U
R%4@
display mode is set to translucent. Wireframe rendering displays a bit faster and xritonG/F
shows more of the technical details. OI?K/ rn
92 * LightTools Introductory Tutorial A5H3%o(6k
h?f>X"*|(
HAPTER 5 Introduction to Backlight Design sv uq gSn
C >^Yq|~[
1.Rotate and zoom the model to that you can see something like the illustration Y=
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below: r.T<j .\
. +Ag!?T
2.To reveal the Property Zones: Xu>r~^w=S
a.Right-click in the Design View and select View Preferences to display this q~5 9F@
dialog box. PmR~ c,
b.On the Visibility tab, click the Property Zone check box to turn it on. w,Lvt
}
c.Click OK. T`9u!#mT=
You will see the wire frame rendering of the spherical bumps on the ^m /oDB-
bottom surface, and a solid color above it. The solid color is the 3D texture ? B E6
of the BEFs (brightness-enhancing films) built automatically by the utility.
