The default number of bumps is 100 (10 X 10). You need to change these f ?zK "
parameters to match your design. Note that LightTools allows many other FKnQwX.0
placement options, but you will use the Bezier placement option for this oHd0
<TO
example. KVpAV$|e
5.On both the X Placement tab and Y Placement tab, change the Number of -G#@BtB2+
Bumps parameter to 300, as shown in the following figure. Click Apply after {<4?o?
1 g
each change. ]G~N+\8]U
6.Click OK to close the dialog box. wf< `J/7u
Note that the number of bumps is 300 X 300, which results in about 90,000 fUKdC \WL
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 8;f<q u|w
manner defined by the Bezier parameterization option. Please see Chapter 5 of IYg3ve`x
the LightTools Core Module User’s Guide for more information. With the BBE1}V!u
current parameter values, the Bezier option varies the bump spacing along the dQ`ZrWd_U
length of the light guide. The spacing in the orthogonal direction is constant. ur,"K' w
The X and Y refer to the local coordinate system of the surface. NG!cEo:2aa
LightTools Introductory Tutorial * 91 r9a! ,^}F
O8~U<'=*
HAPTER 5 Introduction to Backlight Design ::Q);
C Mth`s{sATa
Examining Surface Properties qs1 .@l("
Using the methods described in previous chapters, you may want to check your bW .zxQ :
model before you run a simulation. )LrCoI =|
Click on various parts of the model in the 3D Design View. Or use the System 7 cP[o+
Navigator to select different surfaces and view their Properties. "q>I?UcZ
1.In the System Navigator, click to open BottomSurface of the LightGuide, then pMZf!&tM
click Zones, and then click Texture. :Z]hI+7
2.Select SphericalElement, and then right-click and select Properties from the uQtk|)T E
shortcut menu. The Shape tab shows you a graphical representation of the h)l&K%4;
spherical bump shape that is the bottom of the light guide. fQTA@WAr
You might be curious as to why you cannot see the 3D texture property zones you &G|jzXE
defined. They are invisible by default, because drawing thousands of texture xnuv4Z}]t
elements can make displaying and exploring the model somewhat slow. If you cU5"c)$'
choose to make them visible, 3D textures are displayed in wireframe, even if the *5_ 8\7d
display mode is set to translucent. Wireframe rendering displays a bit faster and QDgEJ%U-
shows more of the technical details. 9_ A0:S9Z
92 * LightTools Introductory Tutorial v Wi. []
X)iWb(@k"7
HAPTER 5 Introduction to Backlight Design +s(I Qt
C 5az
4N T
1.Rotate and zoom the model to that you can see something like the illustration 7}tZ?vD
below: ZR-s{2sl
. {F6dSF`
2.To reveal the Property Zones: U> _\
a.Right-click in the Design View and select View Preferences to display this CNRU"I+jU
dialog box. "kBqY+:Cn
b.On the Visibility tab, click the Property Zone check box to turn it on. B XK::M+
c.Click OK. ) 4L%zl 7
You will see the wire frame rendering of the spherical bumps on the fov=Yd!
bottom surface, and a solid color above it. The solid color is the 3D texture qzlMn)e
of the BEFs (brightness-enhancing films) built automatically by the utility.
