The default number of bumps is 100 (10 X 10). You need to change these SnRTC<DDh
parameters to match your design. Note that LightTools allows many other -Rhxib|<
placement options, but you will use the Bezier placement option for this \. A~>=:
example. _gK@), de
5.On both the X Placement tab and Y Placement tab, change the Number of M=$y_9#
Bumps parameter to 300, as shown in the following figure. Click Apply after @4 m_\]Wy
each change. B&_ 62`
6.Click OK to close the dialog box. BYN<|=
Note that the number of bumps is 300 X 300, which results in about 90,000 v6
DN:!&
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a h3D8eR.
manner defined by the Bezier parameterization option. Please see Chapter 5 of #F.;N<a
the LightTools Core Module User’s Guide for more information. With the '2a }1?
current parameter values, the Bezier option varies the bump spacing along the 4 w^B&e%
length of the light guide. The spacing in the orthogonal direction is constant. 3ryIXC\v
The X and Y refer to the local coordinate system of the surface. v9Oyboh(y
LightTools Introductory Tutorial * 91 KP7bU9odJ
EVM hc"L
HAPTER 5 Introduction to Backlight Design TS muNCR
C uAR!JJ
Examining Surface Properties n *%<!\gJ
Using the methods described in previous chapters, you may want to check your 2i#wJ8vrF
model before you run a simulation. ;uNcrv0J
Click on various parts of the model in the 3D Design View. Or use the System eMVfv=&L<3
Navigator to select different surfaces and view their Properties. L@w|2
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ;"\e
aKl
click Zones, and then click Texture. w-R>g dm
2.Select SphericalElement, and then right-click and select Properties from the n 8Jx;j
shortcut menu. The Shape tab shows you a graphical representation of the EXg\a#4['
spherical bump shape that is the bottom of the light guide. =Z iyT$p
You might be curious as to why you cannot see the 3D texture property zones you " -kb=fY
defined. They are invisible by default, because drawing thousands of texture ,)XT;iGQe
elements can make displaying and exploring the model somewhat slow. If you h{S';/=8
choose to make them visible, 3D textures are displayed in wireframe, even if the }-k<>~FA
display mode is set to translucent. Wireframe rendering displays a bit faster and EkM? Rs
shows more of the technical details. <wxI>T }b
92 * LightTools Introductory Tutorial &}VGC=F;d
@"-<m|lM
HAPTER 5 Introduction to Backlight Design Q3\j4;jI(
C ^<$d Tr'
1.Rotate and zoom the model to that you can see something like the illustration |uQJMf[L)
below: 1b
E$x^P
. zuWj@YG\.
2.To reveal the Property Zones: g/W<;o<v(I
a.Right-click in the Design View and select View Preferences to display this n[CESo%[
dialog box. DIH.c7o
b.On the Visibility tab, click the Property Zone check box to turn it on. Gk*Mx6|N
c.Click OK. D| ,d _W
You will see the wire frame rendering of the spherical bumps on the ($' rV!}
bottom surface, and a solid color above it. The solid color is the 3D texture 9M:wUYHT
of the BEFs (brightness-enhancing films) built automatically by the utility.
