The default number of bumps is 100 (10 X 10). You need to change these <%|u1cn~!v
parameters to match your design. Note that LightTools allows many other &_ @M
6[-
placement options, but you will use the Bezier placement option for this ^G5 fs' d
example. -W/D Cj<
5.On both the X Placement tab and Y Placement tab, change the Number of !Dc;R+Ir0!
Bumps parameter to 300, as shown in the following figure. Click Apply after z 36Y/{>[
each change. ? #doH,
6.Click OK to close the dialog box. S,,Wb &A$
Note that the number of bumps is 300 X 300, which results in about 90,000 'F*OlZ!BWy
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a bF;|0X$
x
manner defined by the Bezier parameterization option. Please see Chapter 5 of ",5=LW&,
the LightTools Core Module User’s Guide for more information. With the SN7 _^F
current parameter values, the Bezier option varies the bump spacing along the xu dZ7
length of the light guide. The spacing in the orthogonal direction is constant. ^[+2P?^K
The X and Y refer to the local coordinate system of the surface. 8t7r^[T
LightTools Introductory Tutorial * 91 -I DhK}C&T
N!tNRMTi
HAPTER 5 Introduction to Backlight Design {~#01p5
C wpNb/U
Examining Surface Properties 8MU7|9 Q
Using the methods described in previous chapters, you may want to check your "*c&[ALw
model before you run a simulation. %3= T7j
Click on various parts of the model in the 3D Design View. Or use the System 1} _<q k9
Navigator to select different surfaces and view their Properties. y+7+({w<
1.In the System Navigator, click to open BottomSurface of the LightGuide, then uTl"4;&j
click Zones, and then click Texture. PVN`k, 4
2.Select SphericalElement, and then right-click and select Properties from the P= E10
shortcut menu. The Shape tab shows you a graphical representation of the 5YUe>P D
spherical bump shape that is the bottom of the light guide. xvWP^Qkb
You might be curious as to why you cannot see the 3D texture property zones you .G<Or`K^i
defined. They are invisible by default, because drawing thousands of texture r' |ei ,
elements can make displaying and exploring the model somewhat slow. If you 3EA _-?
choose to make them visible, 3D textures are displayed in wireframe, even if the =8]Ru(#Ig
display mode is set to translucent. Wireframe rendering displays a bit faster and iP9Dr<P
shows more of the technical details. QY\ 'Uu{
92 * LightTools Introductory Tutorial p lzwk>b_
t`Xx\
HAPTER 5 Introduction to Backlight Design |\ C. il7
C f7%g=0.F
1.Rotate and zoom the model to that you can see something like the illustration jC-`u-_'j
below: SM<qb0
. nAsc^ Yh
2.To reveal the Property Zones: f?@M"p@T
a.Right-click in the Design View and select View Preferences to display this -O@/S9]S)
dialog box. '1G0YfG}n
b.On the Visibility tab, click the Property Zone check box to turn it on. ~jWpD7px
c.Click OK. m ndEB!b
You will see the wire frame rendering of the spherical bumps on the 6Tq2WZ}<'
bottom surface, and a solid color above it. The solid color is the 3D texture G he@m6|D
of the BEFs (brightness-enhancing films) built automatically by the utility.
