The default number of bumps is 100 (10 X 10). You need to change these enQev?8%
parameters to match your design. Note that LightTools allows many other ESY\!X:|
placement options, but you will use the Bezier placement option for this RZ9chTX/
example. <`=(Ui$fD
5.On both the X Placement tab and Y Placement tab, change the Number of oe1$;K>.7
Bumps parameter to 300, as shown in the following figure. Click Apply after N9AM% H$7
each change. wn>?r
?KIB
6.Click OK to close the dialog box. Cbr>\;sc2Z
Note that the number of bumps is 300 X 300, which results in about 90,000 ,6T3:qkkvF
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Ei\tn`I&
manner defined by the Bezier parameterization option. Please see Chapter 5 of !-|{B3"6
the LightTools Core Module User’s Guide for more information. With the >~ * w
current parameter values, the Bezier option varies the bump spacing along the ,uhOf! |
length of the light guide. The spacing in the orthogonal direction is constant. -W" w
The X and Y refer to the local coordinate system of the surface. T oK'Pd
LightTools Introductory Tutorial * 91 OO?B N!
~&8bVA= .
HAPTER 5 Introduction to Backlight Design a.G ;s2>
C "D/\&1.&
Examining Surface Properties y[~w2a&+
Using the methods described in previous chapters, you may want to check your mRD '@n
model before you run a simulation. l 1Ns~
Click on various parts of the model in the 3D Design View. Or use the System #s]` jdc
Navigator to select different surfaces and view their Properties. ,wH]|`w
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Xp_G9I,+
click Zones, and then click Texture. %b3 s|o3An
2.Select SphericalElement, and then right-click and select Properties from the ] @mV9:n{
shortcut menu. The Shape tab shows you a graphical representation of the 4X:S#z
spherical bump shape that is the bottom of the light guide. Hyz:i) 2
You might be curious as to why you cannot see the 3D texture property zones you #bdSH) V
defined. They are invisible by default, because drawing thousands of texture ;{K/W.R
elements can make displaying and exploring the model somewhat slow. If you >_LZD4v! <
choose to make them visible, 3D textures are displayed in wireframe, even if the ZuVucP>>_d
display mode is set to translucent. Wireframe rendering displays a bit faster and ;=E!xfp5U
shows more of the technical details. t8upS
u|
92 * LightTools Introductory Tutorial -|3feYb'
tFYo d#
HAPTER 5 Introduction to Backlight Design xe!6Pgcb
C C:@JLZB
1.Rotate and zoom the model to that you can see something like the illustration `l`)Cs;a
below: t U >?j1
. {Z{!tR?+
2.To reveal the Property Zones: rIZ^ix-N
a.Right-click in the Design View and select View Preferences to display this :]k`;;vh
dialog box. $Z { Xt*
b.On the Visibility tab, click the Property Zone check box to turn it on. EnnE@BJ"
c.Click OK. ^+'\
u;\
You will see the wire frame rendering of the spherical bumps on the +*ZF52hy|
bottom surface, and a solid color above it. The solid color is the 3D texture |$a!Zx94^
of the BEFs (brightness-enhancing films) built automatically by the utility.
