The default number of bumps is 100 (10 X 10). You need to change these KVCj0 6}j
parameters to match your design. Note that LightTools allows many other }
OAH/BW
placement options, but you will use the Bezier placement option for this c Y[qX/0~
example. ;U$EM+9
5.On both the X Placement tab and Y Placement tab, change the Number of K!_''Fg
Bumps parameter to 300, as shown in the following figure. Click Apply after =E'
.T0v
each change. *p 7_rY
6.Click OK to close the dialog box. y7Sj^muBY
Note that the number of bumps is 300 X 300, which results in about 90,000 ^ _pJEX
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a S*?x|& a
manner defined by the Bezier parameterization option. Please see Chapter 5 of =CjN=FM
the LightTools Core Module User’s Guide for more information. With the QLe<).S1B2
current parameter values, the Bezier option varies the bump spacing along the xzTF| Z\
length of the light guide. The spacing in the orthogonal direction is constant. ?u_O(eg
The X and Y refer to the local coordinate system of the surface. $ {)s
~[
LightTools Introductory Tutorial * 91 IRl(H_.
$(eqZ<y
HAPTER 5 Introduction to Backlight Design bdkxCt
C { aq}Q|?/
Examining Surface Properties MuQ'L=i J
Using the methods described in previous chapters, you may want to check your ,]|*~dd>G
model before you run a simulation. }?XNA.Wz
Click on various parts of the model in the 3D Design View. Or use the System h5.AM?*TNd
Navigator to select different surfaces and view their Properties. My JG2C#R
1.In the System Navigator, click to open BottomSurface of the LightGuide, then UI i`bbJ
click Zones, and then click Texture. 6$6Qk !%
2.Select SphericalElement, and then right-click and select Properties from the 1#
X*kF
shortcut menu. The Shape tab shows you a graphical representation of the
e&J_uG
spherical bump shape that is the bottom of the light guide. Ba /^CS
You might be curious as to why you cannot see the 3D texture property zones you w0 0Ba^W
defined. They are invisible by default, because drawing thousands of texture ;#Pc^Yzc1
elements can make displaying and exploring the model somewhat slow. If you =
~^
choose to make them visible, 3D textures are displayed in wireframe, even if the DX%D8atrr
display mode is set to translucent. Wireframe rendering displays a bit faster and \cRe,(?O
shows more of the technical details. h`b[c.%
92 * LightTools Introductory Tutorial y<A%&
3Y+
bIz!
HAPTER 5 Introduction to Backlight Design uw`fC%-xh
C '`fz|.|cbB
1.Rotate and zoom the model to that you can see something like the illustration A%c)=(,
below: }g|)+V\A
. 7 O.{g
2.To reveal the Property Zones: _F9O4Q4
a.Right-click in the Design View and select View Preferences to display this "[BDa}Il
dialog box. JOm6Zc
b.On the Visibility tab, click the Property Zone check box to turn it on. ?\$\YX%/p
c.Click OK. A/ # Xr
You will see the wire frame rendering of the spherical bumps on the #8[ iqvE
bottom surface, and a solid color above it. The solid color is the 3D texture S|?Ht61k
of the BEFs (brightness-enhancing films) built automatically by the utility.
