The default number of bumps is 100 (10 X 10). You need to change these bpP- wA^Hd
parameters to match your design. Note that LightTools allows many other I\e/
Bv^
placement options, but you will use the Bezier placement option for this ^Gi9&fS,
example. q8A ;%.ZLG
5.On both the X Placement tab and Y Placement tab, change the Number of *$e1Bv6
$
Bumps parameter to 300, as shown in the following figure. Click Apply after Db4(E*/pj!
each change. O| K-UTWH%
6.Click OK to close the dialog box. BOt1J_;(rO
Note that the number of bumps is 300 X 300, which results in about 90,000 X* 4C? v
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a _D+pJ{@W
manner defined by the Bezier parameterization option. Please see Chapter 5 of {g9*t}l4
the LightTools Core Module User’s Guide for more information. With the 1Hl -|n
current parameter values, the Bezier option varies the bump spacing along the ^ AhV1rBB
length of the light guide. The spacing in the orthogonal direction is constant. _E %!5u
The X and Y refer to the local coordinate system of the surface. j<NZ4Rf
LightTools Introductory Tutorial * 91 C)UL{n
[=<vapZt
HAPTER 5 Introduction to Backlight Design Gh %R4)}
C [}$jO,H5r
Examining Surface Properties -al\* XDz
Using the methods described in previous chapters, you may want to check your ,3XlX(P
model before you run a simulation. AQ%B&Q(V1
Click on various parts of the model in the 3D Design View. Or use the System 8c`E B-y
Navigator to select different surfaces and view their Properties. A@uU*]TqJ8
1.In the System Navigator, click to open BottomSurface of the LightGuide, then hGU
m7
click Zones, and then click Texture. eI,'7u4q
2.Select SphericalElement, and then right-click and select Properties from the E)3Ah!
shortcut menu. The Shape tab shows you a graphical representation of the :$6mS[@|
spherical bump shape that is the bottom of the light guide. :+_uyp2V
You might be curious as to why you cannot see the 3D texture property zones you Bnp\G h
defined. They are invisible by default, because drawing thousands of texture B4@1WZn<8
elements can make displaying and exploring the model somewhat slow. If you +Y ?) ?
choose to make them visible, 3D textures are displayed in wireframe, even if the 2dsXG$-W2
display mode is set to translucent. Wireframe rendering displays a bit faster and MJ "@
shows more of the technical details. $E/N
92 * LightTools Introductory Tutorial m!5MGq~
gmqA 5W~y
HAPTER 5 Introduction to Backlight Design V15 /~
C (H^)wDb
1.Rotate and zoom the model to that you can see something like the illustration HP Mj+xH
below: C '~E q3
. <
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2.To reveal the Property Zones: o 9rZ&Q <
a.Right-click in the Design View and select View Preferences to display this ~4+ICCbH
dialog box. ,(i`gH{D
b.On the Visibility tab, click the Property Zone check box to turn it on. >P+o NY
c.Click OK. M!Y Gv
You will see the wire frame rendering of the spherical bumps on the A$g'/QM
bottom surface, and a solid color above it. The solid color is the 3D texture 7}1Z7"?
of the BEFs (brightness-enhancing films) built automatically by the utility.
