The default number of bumps is 100 (10 X 10). You need to change these x-&@wMqkc
parameters to match your design. Note that LightTools allows many other \n|EM@=eE
placement options, but you will use the Bezier placement option for this PBTnIU
example. JYbL ?N
5.On both the X Placement tab and Y Placement tab, change the Number of o u{2@"
Bumps parameter to 300, as shown in the following figure. Click Apply after l ?n\i]'
each change. K^<BW(s
6.Click OK to close the dialog box. ]K,Tn yp
Note that the number of bumps is 300 X 300, which results in about 90,000 Od,qbU 4O
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a @O^6&\s>
manner defined by the Bezier parameterization option. Please see Chapter 5 of @YTaS z$L
the LightTools Core Module User’s Guide for more information. With the ,S ]7 'UP
current parameter values, the Bezier option varies the bump spacing along the =R$u[~Xl2X
length of the light guide. The spacing in the orthogonal direction is constant. d k4Cp N
The X and Y refer to the local coordinate system of the surface. 68C%B9.b'
LightTools Introductory Tutorial * 91 Ig0VW) @
= x)-u8P
HAPTER 5 Introduction to Backlight Design PmEsN&YP]
C O`t&ldU
Examining Surface Properties V#gK$uv
Using the methods described in previous chapters, you may want to check your ^KT Y?
model before you run a simulation. !9VY|&fHe
Click on various parts of the model in the 3D Design View. Or use the System rlSeu5X6
Navigator to select different surfaces and view their Properties. c2 C8g1n
1.In the System Navigator, click to open BottomSurface of the LightGuide, then m'=Cr ei
click Zones, and then click Texture. wIaony
2.Select SphericalElement, and then right-click and select Properties from the !@ *7e:l
shortcut menu. The Shape tab shows you a graphical representation of the h_,i&d@(
spherical bump shape that is the bottom of the light guide. xHLlMn4M
You might be curious as to why you cannot see the 3D texture property zones you ShP^A"Do
defined. They are invisible by default, because drawing thousands of texture ~H<6gN<j(.
elements can make displaying and exploring the model somewhat slow. If you czg O ;3-C
choose to make them visible, 3D textures are displayed in wireframe, even if the 9`X\6s
display mode is set to translucent. Wireframe rendering displays a bit faster and [uN?
~lp\%
shows more of the technical details. A d9 }9!<
92 * LightTools Introductory Tutorial ~t~k2^)|"
fW1CFRHH
HAPTER 5 Introduction to Backlight Design %axh`xK#
C }?_?V&K|
1.Rotate and zoom the model to that you can see something like the illustration ,77d(bR <
below: w(3G&11N?
. |a`Sc %
2.To reveal the Property Zones: ?(F6#"/E
a.Right-click in the Design View and select View Preferences to display this MKD1V8i
dialog box. )e=D(qd
b.On the Visibility tab, click the Property Zone check box to turn it on. N gGp
c.Click OK. Q%f^)HZGR
You will see the wire frame rendering of the spherical bumps on the '9Xu
p
bottom surface, and a solid color above it. The solid color is the 3D texture h-K_L r]
of the BEFs (brightness-enhancing films) built automatically by the utility.
