The default number of bumps is 100 (10 X 10). You need to change these r)qow.+&
parameters to match your design. Note that LightTools allows many other gavf$be
placement options, but you will use the Bezier placement option for this }`$( {\^w
example. , YE+k`:
5.On both the X Placement tab and Y Placement tab, change the Number of +>mU4Fwp
Bumps parameter to 300, as shown in the following figure. Click Apply after 1G , '
each change. :,^x?'HK
6.Click OK to close the dialog box. +{ e2TY
Note that the number of bumps is 300 X 300, which results in about 90,000 FO|Eg9l
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a jA%R8hdr_
manner defined by the Bezier parameterization option. Please see Chapter 5 of %8% 0l*n'
the LightTools Core Module User’s Guide for more information. With the
3AuLRI
current parameter values, the Bezier option varies the bump spacing along the L|2WTyMU
length of the light guide. The spacing in the orthogonal direction is constant. ss7Z-A 4z
The X and Y refer to the local coordinate system of the surface. 1NlpOVq:)
LightTools Introductory Tutorial * 91 UD ]RWN
6O'B:5~[2
HAPTER 5 Introduction to Backlight Design l(tMo7iPa
C 7tT L,Nxe
Examining Surface Properties lS`VJA6l.
Using the methods described in previous chapters, you may want to check your nfr..4,:
model before you run a simulation. YQfQ[{kp
Click on various parts of the model in the 3D Design View. Or use the System Fmrl*tr
Navigator to select different surfaces and view their Properties. Mg^3Y'{o
1.In the System Navigator, click to open BottomSurface of the LightGuide, then -v WX L
click Zones, and then click Texture.
pe`&zI_`?
2.Select SphericalElement, and then right-click and select Properties from the fJG!TQJ[Y
shortcut menu. The Shape tab shows you a graphical representation of the {f% x8t$
spherical bump shape that is the bottom of the light guide. 2 4_/J Dz
You might be curious as to why you cannot see the 3D texture property zones you f'M7x6W
defined. They are invisible by default, because drawing thousands of texture O#D
N 3yu?
elements can make displaying and exploring the model somewhat slow. If you +@C|u'
choose to make them visible, 3D textures are displayed in wireframe, even if the s\1c.
display mode is set to translucent. Wireframe rendering displays a bit faster and ATU] KL!{
shows more of the technical details. RZKczZGZg
92 * LightTools Introductory Tutorial ^pa -2Ao6
..ht)Gex
HAPTER 5 Introduction to Backlight Design Rwz (20n\^
C u Qg&A`4
1.Rotate and zoom the model to that you can see something like the illustration yy3-Xu4
below: _Nq7_iT0
. ulnlRx
2.To reveal the Property Zones: wd~!j&`a
a.Right-click in the Design View and select View Preferences to display this :E9 @9>3S
dialog box. RV+0C&0ff
b.On the Visibility tab, click the Property Zone check box to turn it on. [mI;>q
c.Click OK. {f)"F;]V
You will see the wire frame rendering of the spherical bumps on the Y]t)k9|vv
bottom surface, and a solid color above it. The solid color is the 3D texture 'd
6z^Z6
of the BEFs (brightness-enhancing films) built automatically by the utility.
