The default number of bumps is 100 (10 X 10). You need to change these *FkG32k
parameters to match your design. Note that LightTools allows many other $^Dx4:k<2
placement options, but you will use the Bezier placement option for this mlR*S<Z
example. szC~?]<YY
5.On both the X Placement tab and Y Placement tab, change the Number of _-*Lj;^V
Bumps parameter to 300, as shown in the following figure. Click Apply after $e; _N4d^
each change. I-NzGx2u
6.Click OK to close the dialog box. VN[h0+n4Th
Note that the number of bumps is 300 X 300, which results in about 90,000 38dXfl
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a %p}_4+[;
manner defined by the Bezier parameterization option. Please see Chapter 5 of r[zxb0YA
the LightTools Core Module User’s Guide for more information. With the V@Z8t8
current parameter values, the Bezier option varies the bump spacing along the
`?Yh`P0
length of the light guide. The spacing in the orthogonal direction is constant. h$p]#]uMb
The X and Y refer to the local coordinate system of the surface. xD;5z`A3
LightTools Introductory Tutorial * 91 32=Gq5pOc
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Dk5-W
HAPTER 5 Introduction to Backlight Design Vc3tKuMsiX
C *f:^ 6h
Examining Surface Properties #5kQn>R
Using the methods described in previous chapters, you may want to check your
]k%Yz@*S
model before you run a simulation. _yyQ^M/
Click on various parts of the model in the 3D Design View. Or use the System 2;G^>BP<
Navigator to select different surfaces and view their Properties. Da!A1|"
1.In the System Navigator, click to open BottomSurface of the LightGuide, then u0^:
XwZ!
click Zones, and then click Texture. e uS"C*
2.Select SphericalElement, and then right-click and select Properties from the &,xN$
shortcut menu. The Shape tab shows you a graphical representation of the D L_{q6ZK
spherical bump shape that is the bottom of the light guide. bE2^sx`(
You might be curious as to why you cannot see the 3D texture property zones you kScq#<Y&
defined. They are invisible by default, because drawing thousands of texture I_J;/!l=
elements can make displaying and exploring the model somewhat slow. If you ?5nF` [r x
choose to make them visible, 3D textures are displayed in wireframe, even if the K v C`6
display mode is set to translucent. Wireframe rendering displays a bit faster and iK6L\ 'k
shows more of the technical details. V+X>t7.Q
92 * LightTools Introductory Tutorial D;It0 "
'H2TwSbIXI
HAPTER 5 Introduction to Backlight Design ^ c}Z$V
C w} *;^n
1.Rotate and zoom the model to that you can see something like the illustration +$_W4lf|E2
below: *ta
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. pGz-5afL
2.To reveal the Property Zones: + ?n81|7`
a.Right-click in the Design View and select View Preferences to display this w{Wz^= ';
dialog box. 6)m}e?D>
b.On the Visibility tab, click the Property Zone check box to turn it on. w1/p wzn
c.Click OK. p5c^dC{
You will see the wire frame rendering of the spherical bumps on the @CU3V+
bottom surface, and a solid color above it. The solid color is the 3D texture aEVBU
of the BEFs (brightness-enhancing films) built automatically by the utility.
