The default number of bumps is 100 (10 X 10). You need to change these yto[8 ;)_
parameters to match your design. Note that LightTools allows many other k$N0lR4:p
placement options, but you will use the Bezier placement option for this c 6"Ib)
example. |7"$ w%2
5.On both the X Placement tab and Y Placement tab, change the Number of 7]E m ,
Bumps parameter to 300, as shown in the following figure. Click Apply after :^i^0dC
each change. jV O{$j
6.Click OK to close the dialog box. Y9Z]i$qS&k
Note that the number of bumps is 300 X 300, which results in about 90,000 +5!&E7bcd
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a !R'g59g
manner defined by the Bezier parameterization option. Please see Chapter 5 of VT\ "q1)p
the LightTools Core Module User’s Guide for more information. With the
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current parameter values, the Bezier option varies the bump spacing along the 6cz/n8M g
length of the light guide. The spacing in the orthogonal direction is constant. * 27*>W1
The X and Y refer to the local coordinate system of the surface. o.m:3!RW
LightTools Introductory Tutorial * 91 a~PK
pw2%
*nC(-(r:J`
HAPTER 5 Introduction to Backlight Design NBYH;h P
C yVX8e I
Examining Surface Properties i afE5b)
Using the methods described in previous chapters, you may want to check your d$t40+v
model before you run a simulation. ~g6 3qs
Click on various parts of the model in the 3D Design View. Or use the System MHU74//fe
Navigator to select different surfaces and view their Properties. DF _X
1.In the System Navigator, click to open BottomSurface of the LightGuide, then q_V0+qH
click Zones, and then click Texture. O hVs #^
2.Select SphericalElement, and then right-click and select Properties from the =>iA gp'#
shortcut menu. The Shape tab shows you a graphical representation of the H,QTYXi "
spherical bump shape that is the bottom of the light guide. _%/}>L>-`8
You might be curious as to why you cannot see the 3D texture property zones you AY,].Zg[
defined. They are invisible by default, because drawing thousands of texture 0.Ta Xbi
elements can make displaying and exploring the model somewhat slow. If you z//VlB
choose to make them visible, 3D textures are displayed in wireframe, even if the =Yz'D|=t
display mode is set to translucent. Wireframe rendering displays a bit faster and HCWNo
shows more of the technical details. V5i*O3a~
92 * LightTools Introductory Tutorial E&`Nh5 JfC
l{Dct\ #s
HAPTER 5 Introduction to Backlight Design 3djC;*, 9,
C A\fb<
1.Rotate and zoom the model to that you can see something like the illustration 9 QQyl\
below: gNYqAUG5
. up>c$jJ
2.To reveal the Property Zones: ;G\8jP '
a.Right-click in the Design View and select View Preferences to display this q1?&Ev^
dialog box. 8NBT|N~N
b.On the Visibility tab, click the Property Zone check box to turn it on. zCv" ]%
c.Click OK. S35~Cp
You will see the wire frame rendering of the spherical bumps on the \xv;sl$f
bottom surface, and a solid color above it. The solid color is the 3D texture e:'?*BYVg3
of the BEFs (brightness-enhancing films) built automatically by the utility.
