The default number of bumps is 100 (10 X 10). You need to change these 3WY:Fn+#
parameters to match your design. Note that LightTools allows many other l, E4h-$
placement options, but you will use the Bezier placement option for this <Ow +LJWQK
example. 8EZ, hY^
5.On both the X Placement tab and Y Placement tab, change the Number of +PHuQ
Bumps parameter to 300, as shown in the following figure. Click Apply after toC|vn&P
each change. G)7J$4R
6.Click OK to close the dialog box. ch0x*[N@
Note that the number of bumps is 300 X 300, which results in about 90,000 1.z !u%2
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a SQf.R%cg$
manner defined by the Bezier parameterization option. Please see Chapter 5 of N_y#Y{c{(
the LightTools Core Module User’s Guide for more information. With the s Qa9M
current parameter values, the Bezier option varies the bump spacing along the 7Y*Q)DDy
length of the light guide. The spacing in the orthogonal direction is constant. E&|EokSyN
The X and Y refer to the local coordinate system of the surface. v7D3aWoe
LightTools Introductory Tutorial * 91 _v=zF pR
<+;
cgF!+
HAPTER 5 Introduction to Backlight Design U{-[lpd
C ltXGm)+
Examining Surface Properties {Gr"oO`&"
Using the methods described in previous chapters, you may want to check your *|/kKvN
model before you run a simulation. v!rOT/I
Click on various parts of the model in the 3D Design View. Or use the System z_9q T"vF
Navigator to select different surfaces and view their Properties. ;?!pcv Ui
1.In the System Navigator, click to open BottomSurface of the LightGuide, then z%WOv ~8~
click Zones, and then click Texture. F}_Zh9/$(
2.Select SphericalElement, and then right-click and select Properties from the A-qpuI;f
shortcut menu. The Shape tab shows you a graphical representation of the I$Fr 8R$
spherical bump shape that is the bottom of the light guide. +P "u1q*+p
You might be curious as to why you cannot see the 3D texture property zones you DBzF\-
defined. They are invisible by default, because drawing thousands of texture 'lR f
elements can make displaying and exploring the model somewhat slow. If you ^NOy: >
choose to make them visible, 3D textures are displayed in wireframe, even if the :<E\&6# oC
display mode is set to translucent. Wireframe rendering displays a bit faster and '3ZYoA%
shows more of the technical details. K/XUF#^B]
92 * LightTools Introductory Tutorial !EO
2
{]:B80I;2
HAPTER 5 Introduction to Backlight Design [fXC ;c1
C k.w}}78N2N
1.Rotate and zoom the model to that you can see something like the illustration zH?&FtO
below: ~dj4Q
eu
. tsqWnz=)
2.To reveal the Property Zones: JWs?az
a.Right-click in the Design View and select View Preferences to display this h5m6 )0"
dialog box. d0@czNWIC
b.On the Visibility tab, click the Property Zone check box to turn it on. q
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c.Click OK. t M{U6 k
You will see the wire frame rendering of the spherical bumps on the uB uwE 6
bottom surface, and a solid color above it. The solid color is the 3D texture {_*$X
of the BEFs (brightness-enhancing films) built automatically by the utility.
