The default number of bumps is 100 (10 X 10). You need to change these <3iMRe
parameters to match your design. Note that LightTools allows many other z Dp 2g)
placement options, but you will use the Bezier placement option for this 49P 4b<1
example. 8t`?#8D}
5.On both the X Placement tab and Y Placement tab, change the Number of B!yr!DWv
Bumps parameter to 300, as shown in the following figure. Click Apply after 9L9sqZUB
each change. V]&\fk-{
6.Click OK to close the dialog box. q4q6c")zp
Note that the number of bumps is 300 X 300, which results in about 90,000 SuznN
L=/$
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a NI5``BwpO
manner defined by the Bezier parameterization option. Please see Chapter 5 of $(
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the LightTools Core Module User’s Guide for more information. With the g0
[w-?f
current parameter values, the Bezier option varies the bump spacing along the l%ZhA=TKQ
length of the light guide. The spacing in the orthogonal direction is constant. )Z$!PqRw@u
The X and Y refer to the local coordinate system of the surface. l0]
EX>"E
LightTools Introductory Tutorial * 91 Q\)F;: |
_ |p8M!
HAPTER 5 Introduction to Backlight Design |}1d Fp
C |%wX*z af
Examining Surface Properties A
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Using the methods described in previous chapters, you may want to check your >7r!~+B"9'
model before you run a simulation. CARzO7 b\w
Click on various parts of the model in the 3D Design View. Or use the System S'14hk<
Navigator to select different surfaces and view their Properties. X 8|EHb<
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ) +M0Y_r
click Zones, and then click Texture. E9}C #
2.Select SphericalElement, and then right-click and select Properties from the ':W[ A
shortcut menu. The Shape tab shows you a graphical representation of the zzz3 Bq~
spherical bump shape that is the bottom of the light guide. F?cK- .
You might be curious as to why you cannot see the 3D texture property zones you +#By* ;BJ
defined. They are invisible by default, because drawing thousands of texture -/k 3a*$/
elements can make displaying and exploring the model somewhat slow. If you F/Pep? '
choose to make them visible, 3D textures are displayed in wireframe, even if the N7_"H>O$0U
display mode is set to translucent. Wireframe rendering displays a bit faster and eFAnFJ][L
shows more of the technical details. fh{`Mz,o
92 * LightTools Introductory Tutorial Ie^l~ Gb
:LTN!jj
HAPTER 5 Introduction to Backlight Design KG@8Rt HsQ
C V1?]|HTQcT
1.Rotate and zoom the model to that you can see something like the illustration zJXplvaL;
below: j9,P/K$:w
. !c-*O<Y
2.To reveal the Property Zones: .o8t+X'G
a.Right-click in the Design View and select View Preferences to display this +3 `alHUK
dialog box. zVD:#d% b
b.On the Visibility tab, click the Property Zone check box to turn it on. nie % eC&U
c.Click OK. ExM,g ' 7
You will see the wire frame rendering of the spherical bumps on the fatf*}eln
bottom surface, and a solid color above it. The solid color is the 3D texture `kr?j:g
of the BEFs (brightness-enhancing films) built automatically by the utility.
