The default number of bumps is 100 (10 X 10). You need to change these H q6%$!q
parameters to match your design. Note that LightTools allows many other as@8L|i*
placement options, but you will use the Bezier placement option for this sRt 7 .fe
example. @V
' HX
5.On both the X Placement tab and Y Placement tab, change the Number of %2:UsI
Bumps parameter to 300, as shown in the following figure. Click Apply after +QN4h JK
each change. 0BXr[%{`
6.Click OK to close the dialog box. N[cIr{XBGN
Note that the number of bumps is 300 X 300, which results in about 90,000 z\eQB% aM
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ^;F/^ _
manner defined by the Bezier parameterization option. Please see Chapter 5 of neU=1socJ
the LightTools Core Module User’s Guide for more information. With the ykC3Z<pI.
current parameter values, the Bezier option varies the bump spacing along the Qhj' ]>#g
length of the light guide. The spacing in the orthogonal direction is constant. w> B}w
The X and Y refer to the local coordinate system of the surface. wNUT0 +
LightTools Introductory Tutorial * 91 ;y(;7n_ a
J=-z~\f56
HAPTER 5 Introduction to Backlight Design !/,oQoG
C \l g
^rfj
Examining Surface Properties )Ra:s>
Using the methods described in previous chapters, you may want to check your f(y+1
model before you run a simulation. ir6aV|ea!
Click on various parts of the model in the 3D Design View. Or use the System W/UA%We3+L
Navigator to select different surfaces and view their Properties. 8)S)!2_h
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 7> f2P!:
click Zones, and then click Texture. "" UyfC[
2.Select SphericalElement, and then right-click and select Properties from the rfonM~3?'
shortcut menu. The Shape tab shows you a graphical representation of the )M<+?R$];
spherical bump shape that is the bottom of the light guide. \~8W0q.4M
You might be curious as to why you cannot see the 3D texture property zones you W_@ b . 1
defined. They are invisible by default, because drawing thousands of texture u43Mo\"<&%
elements can make displaying and exploring the model somewhat slow. If you ,6]ID1o:y
choose to make them visible, 3D textures are displayed in wireframe, even if the #;8)UNc)}
display mode is set to translucent. Wireframe rendering displays a bit faster and ,Mw93Kp
Va
shows more of the technical details. VKPE oy8H
92 * LightTools Introductory Tutorial 9"^ib9M
,esEh5=Ir
HAPTER 5 Introduction to Backlight Design 79 4U Y
C 0y|1@CS
1.Rotate and zoom the model to that you can see something like the illustration M
IIa8 ;
below: fDDpR=
. %1TKgNf
2.To reveal the Property Zones: j)/Vtf
a.Right-click in the Design View and select View Preferences to display this rd&d~R 6
dialog box. ;>2 -
b.On the Visibility tab, click the Property Zone check box to turn it on. K\ Wzh;
c.Click OK. 5
Y&`Z J
You will see the wire frame rendering of the spherical bumps on the T"P}` mT
bottom surface, and a solid color above it. The solid color is the 3D texture 9X*Z\-
of the BEFs (brightness-enhancing films) built automatically by the utility.
