The default number of bumps is 100 (10 X 10). You need to change these R[(,wY_1
parameters to match your design. Note that LightTools allows many other &P;x<7h$t?
placement options, but you will use the Bezier placement option for this :A$6Y*s\
example. O]>O r3oO
5.On both the X Placement tab and Y Placement tab, change the Number of d3\8BKp
Bumps parameter to 300, as shown in the following figure. Click Apply after ` C1LR ,J
each change. sM-*[Q=_
6.Click OK to close the dialog box. 4Y]`> ;w
Note that the number of bumps is 300 X 300, which results in about 90,000 " YBA$ef$
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a >@X=E3
manner defined by the Bezier parameterization option. Please see Chapter 5 of Um~jp:6p
the LightTools Core Module User’s Guide for more information. With the bMZ0%(q
current parameter values, the Bezier option varies the bump spacing along the > <=af 9T
length of the light guide. The spacing in the orthogonal direction is constant. h\5
7t@A
The X and Y refer to the local coordinate system of the surface. ;#
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LightTools Introductory Tutorial * 91 lbPxZ'YO#
_I9TG.AA.
HAPTER 5 Introduction to Backlight Design sk5 \"jna
C 17 GyE=Uu
Examining Surface Properties (mE Z4yM
Using the methods described in previous chapters, you may want to check your v6GWD}HH,
model before you run a simulation. ,iyIF~1~#>
Click on various parts of the model in the 3D Design View. Or use the System #yqcUbJY0R
Navigator to select different surfaces and view their Properties. m} V, +E
1.In the System Navigator, click to open BottomSurface of the LightGuide, then B}Qo8i7
z
click Zones, and then click Texture. ovl@[>OB
2.Select SphericalElement, and then right-click and select Properties from the #wo _
shortcut menu. The Shape tab shows you a graphical representation of the ] !H<vR$8
spherical bump shape that is the bottom of the light guide. 9 7g\n q<
You might be curious as to why you cannot see the 3D texture property zones you S.I<Hs
defined. They are invisible by default, because drawing thousands of texture ]mc,FlhU@
elements can make displaying and exploring the model somewhat slow. If you P$D r6;
choose to make them visible, 3D textures are displayed in wireframe, even if the oH;Y } h
display mode is set to translucent. Wireframe rendering displays a bit faster and VKlD"UTk
shows more of the technical details. T:-Uy&pBEN
92 * LightTools Introductory Tutorial VS` S@+p
bI H2cJ
HAPTER 5 Introduction to Backlight Design ~UnfS};U
C 3lJK[V{'#'
1.Rotate and zoom the model to that you can see something like the illustration q<1@ut
below: >[p+L= '
. j}|6k6t
2.To reveal the Property Zones: t! ~mbx+
a.Right-click in the Design View and select View Preferences to display this G{J9F b8
dialog box. e0q a ~5
b.On the Visibility tab, click the Property Zone check box to turn it on. `S VR_
c.Click OK. B)(A#&nr b
You will see the wire frame rendering of the spherical bumps on the 2@H~ nw 0
bottom surface, and a solid color above it. The solid color is the 3D texture s)C.e# xl
of the BEFs (brightness-enhancing films) built automatically by the utility.
