The default number of bumps is 100 (10 X 10). You need to change these 1% ` Rs
parameters to match your design. Note that LightTools allows many other XiWmV ?
placement options, but you will use the Bezier placement option for this %|oym.-I6
example. f o3}W^0
5.On both the X Placement tab and Y Placement tab, change the Number of ~}
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Bumps parameter to 300, as shown in the following figure. Click Apply after P%n>Tg80M
each change. $`8wJf9@w
6.Click OK to close the dialog box. 8oGRLYU N
Note that the number of bumps is 300 X 300, which results in about 90,000 307I$*%W
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a QT}tvm@PMq
manner defined by the Bezier parameterization option. Please see Chapter 5 of 2=}FBA, 2
the LightTools Core Module User’s Guide for more information. With the Q>z8IlJ}
current parameter values, the Bezier option varies the bump spacing along the V7/Rby Q
length of the light guide. The spacing in the orthogonal direction is constant. 53 h0UL
The X and Y refer to the local coordinate system of the surface. H5an%kU|j
LightTools Introductory Tutorial * 91 bN.Pex
HzJz+ x:
HAPTER 5 Introduction to Backlight Design 6A ah9
C lB4WKn=?Kl
Examining Surface Properties 7tp36 TE
Using the methods described in previous chapters, you may want to check your *Pr ) %
model before you run a simulation. "dlV k~
Click on various parts of the model in the 3D Design View. Or use the System WIGi51yC.x
Navigator to select different surfaces and view their Properties. 0g;|y4SN=
1.In the System Navigator, click to open BottomSurface of the LightGuide, then E{(;@PzE
click Zones, and then click Texture. kx^/*~ex
2.Select SphericalElement, and then right-click and select Properties from the ar,7S&s H
shortcut menu. The Shape tab shows you a graphical representation of the j>kqz>3
spherical bump shape that is the bottom of the light guide. +ZV5o&V>
You might be curious as to why you cannot see the 3D texture property zones you t{>q|0
defined. They are invisible by default, because drawing thousands of texture wd 6owr
elements can make displaying and exploring the model somewhat slow. If you D%Z|
choose to make them visible, 3D textures are displayed in wireframe, even if the dh\P4
display mode is set to translucent. Wireframe rendering displays a bit faster and ,zc(t<|-y
shows more of the technical details. |W^IlqTH
92 * LightTools Introductory Tutorial l,).p
cwL _tq
HAPTER 5 Introduction to Backlight Design dRMx[7jVA
C \)e'`29;
1.Rotate and zoom the model to that you can see something like the illustration ,,r>,Xq 6
below: 5r 0YA
IJ
. KPk i}'GO
2.To reveal the Property Zones: $[|mGae
a.Right-click in the Design View and select View Preferences to display this v[<T]1=LRC
dialog box. ^zr`;cJ +c
b.On the Visibility tab, click the Property Zone check box to turn it on. dr"1s-D4IQ
c.Click OK. 7p[n
You will see the wire frame rendering of the spherical bumps on the i/.6>4tE:
bottom surface, and a solid color above it. The solid color is the 3D texture ~#/
of the BEFs (brightness-enhancing films) built automatically by the utility.
