The default number of bumps is 100 (10 X 10). You need to change these 1
A
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parameters to match your design. Note that LightTools allows many other {e9@-
placement options, but you will use the Bezier placement option for this 1&evG-#<:
example. 6x[}g
5.On both the X Placement tab and Y Placement tab, change the Number of m6&~Hf wN
Bumps parameter to 300, as shown in the following figure. Click Apply after ?; +1)> {
each change. a /l)qB#
6.Click OK to close the dialog box. i&66Fi1
Note that the number of bumps is 300 X 300, which results in about 90,000
}mq6]ZrK
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a cr?Q[8%t1
manner defined by the Bezier parameterization option. Please see Chapter 5 of L M bn
the LightTools Core Module User’s Guide for more information. With the ex 9g?*Q
current parameter values, the Bezier option varies the bump spacing along the 5Y'qaIFR
length of the light guide. The spacing in the orthogonal direction is constant. aweV#j(y
The X and Y refer to the local coordinate system of the surface. 2 %@4]
LightTools Introductory Tutorial * 91 E=CsIK
#Z`q+@@ ]A
HAPTER 5 Introduction to Backlight Design ,+vy,<e&
C m=A(NKZ
Examining Surface Properties m}aB?+i
Using the methods described in previous chapters, you may want to check your kmsb hYM)
model before you run a simulation. A gg<tM{yB
Click on various parts of the model in the 3D Design View. Or use the System aS{n8P6vW
Navigator to select different surfaces and view their Properties. AJ? r,!)
1.In the System Navigator, click to open BottomSurface of the LightGuide, then EZy)A$|
click Zones, and then click Texture. gk[aM~p
2.Select SphericalElement, and then right-click and select Properties from the n E& @Q
shortcut menu. The Shape tab shows you a graphical representation of the ( vPN5F
spherical bump shape that is the bottom of the light guide. \y)rt )
You might be curious as to why you cannot see the 3D texture property zones you ^ H ThN
defined. They are invisible by default, because drawing thousands of texture 4Lh!8g=/
elements can make displaying and exploring the model somewhat slow. If you lhz{1P]s
choose to make them visible, 3D textures are displayed in wireframe, even if the J^nBdofP
display mode is set to translucent. Wireframe rendering displays a bit faster and ox>^>wR*
shows more of the technical details. #A Sz;$P
92 * LightTools Introductory Tutorial 7>|J8*/Nd
)}]g]
g
HAPTER 5 Introduction to Backlight Design gA5/,wDO
C {M$1N5Eh
1.Rotate and zoom the model to that you can see something like the illustration > CgTs
below: goRL1L,5
. }Qc@m9; bH
2.To reveal the Property Zones: w%VU/6~
a.Right-click in the Design View and select View Preferences to display this A v$^
dialog box. 1 N^[.=
b.On the Visibility tab, click the Property Zone check box to turn it on. kg~mgMR+w
c.Click OK. :q7Wy&ow
You will see the wire frame rendering of the spherical bumps on the I^]2K0+x x
bottom surface, and a solid color above it. The solid color is the 3D texture Zq|I, l0+E
of the BEFs (brightness-enhancing films) built automatically by the utility.
