The default number of bumps is 100 (10 X 10). You need to change these ( 1 L9K;
parameters to match your design. Note that LightTools allows many other [r_ YQ*+ej
placement options, but you will use the Bezier placement option for this _1s\ztDpw
example. B=>:w%<Ii
5.On both the X Placement tab and Y Placement tab, change the Number of D!K){ E
Bumps parameter to 300, as shown in the following figure. Click Apply after q`l&G%
each change. y+ZRh?2
6.Click OK to close the dialog box. BCw5.@HK*
Note that the number of bumps is 300 X 300, which results in about 90,000 Dlc=[kf9
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a yFIB/ln:
manner defined by the Bezier parameterization option. Please see Chapter 5 of 9]ga\>v
the LightTools Core Module User’s Guide for more information. With the }b// oe7
current parameter values, the Bezier option varies the bump spacing along the ?!N@%R>5rN
length of the light guide. The spacing in the orthogonal direction is constant. `
>w4G|{
The X and Y refer to the local coordinate system of the surface. i\2d1Z
LightTools Introductory Tutorial * 91 @~4Q\^;NX
0 Zt=1Tv
HAPTER 5 Introduction to Backlight Design EFb1Y{u^\!
C % gF; A*
Examining Surface Properties XHX \+&6
Using the methods described in previous chapters, you may want to check your U]Iypl`l
model before you run a simulation. X~aD\%kC7
Click on various parts of the model in the 3D Design View. Or use the System j}0W|*
Navigator to select different surfaces and view their Properties. `N+A8
1.In the System Navigator, click to open BottomSurface of the LightGuide, then U_/sY9gz(
click Zones, and then click Texture. Hs%;uyI@$
2.Select SphericalElement, and then right-click and select Properties from the ]h(}%fk_
shortcut menu. The Shape tab shows you a graphical representation of the w]4=uL6
spherical bump shape that is the bottom of the light guide. (*.t~6c?5
You might be curious as to why you cannot see the 3D texture property zones you ?2Q9z-$
defined. They are invisible by default, because drawing thousands of texture MwoU>+XB
elements can make displaying and exploring the model somewhat slow. If you :8} iZ.
choose to make them visible, 3D textures are displayed in wireframe, even if the 6Un 61s
display mode is set to translucent. Wireframe rendering displays a bit faster and we6kV-L.
shows more of the technical details. ]et4B +=i
92 * LightTools Introductory Tutorial ^8,Y1r9`$
nqG9$!k^t
HAPTER 5 Introduction to Backlight Design )c'5M]V
C Pj4WWK X
1.Rotate and zoom the model to that you can see something like the illustration QJBzv|
below: CM}1:o<<N
. o"O=Epg
2.To reveal the Property Zones: ~! *xi
a.Right-click in the Design View and select View Preferences to display this =")}wl=s
dialog box. 2>l
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b.On the Visibility tab, click the Property Zone check box to turn it on. '=|2, H]
c.Click OK. A!([k}@=j
You will see the wire frame rendering of the spherical bumps on the < ,U=w[cH
bottom surface, and a solid color above it. The solid color is the 3D texture M YQZqlV
of the BEFs (brightness-enhancing films) built automatically by the utility.
