The default number of bumps is 100 (10 X 10). You need to change these \$I
)}
parameters to match your design. Note that LightTools allows many other t +VPX2
placement options, but you will use the Bezier placement option for this xHmc8G$zu
example. _<$=n 6#
5.On both the X Placement tab and Y Placement tab, change the Number of 8~bPo WP
Bumps parameter to 300, as shown in the following figure. Click Apply after $i hI Hl6'
each change.
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6.Click OK to close the dialog box. , /pE*Yk
Note that the number of bumps is 300 X 300, which results in about 90,000 ~Hq
2'
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a _gHJ4(?w
manner defined by the Bezier parameterization option. Please see Chapter 5 of e-WaK0Ep
the LightTools Core Module User’s Guide for more information. With the ? !ig/ufZ
current parameter values, the Bezier option varies the bump spacing along the d$ /o\G
length of the light guide. The spacing in the orthogonal direction is constant. K:0RP?L
The X and Y refer to the local coordinate system of the surface. Kj7Osqu2bE
LightTools Introductory Tutorial * 91 )]}*o O
sC$X7h(Q+
HAPTER 5 Introduction to Backlight Design t
t=$:}A
C LLMkv!%D
Examining Surface Properties
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Using the methods described in previous chapters, you may want to check your sdY6_ HtE
model before you run a simulation. < 5.{ +!BM
Click on various parts of the model in the 3D Design View. Or use the System w? [)nlNW
Navigator to select different surfaces and view their Properties. 6\bbP>ql
1.In the System Navigator, click to open BottomSurface of the LightGuide, then (8 {Z@
click Zones, and then click Texture. ]lo O 5
2.Select SphericalElement, and then right-click and select Properties from the Kfi A 7 W
shortcut menu. The Shape tab shows you a graphical representation of the W ^x[ma z
spherical bump shape that is the bottom of the light guide. sTb/l!= o
You might be curious as to why you cannot see the 3D texture property zones you {"<Q?yA2y
defined. They are invisible by default, because drawing thousands of texture _R ]1J0
elements can make displaying and exploring the model somewhat slow. If you f,$CiZ"
choose to make them visible, 3D textures are displayed in wireframe, even if the nD_g84us
display mode is set to translucent. Wireframe rendering displays a bit faster and [x&&N*>N
shows more of the technical details. gyPF!"!5dq
92 * LightTools Introductory Tutorial -vMP{,
yP@= x!$
HAPTER 5 Introduction to Backlight Design _tjH=Ff$
C /xmd]XM=_
1.Rotate and zoom the model to that you can see something like the illustration 1osI~oNZ
below: QM IQy
. {Hb _o)S
2.To reveal the Property Zones: UY== 1\
a.Right-click in the Design View and select View Preferences to display this ?TXFOr]g]2
dialog box. `s+qz
b.On the Visibility tab, click the Property Zone check box to turn it on. rS cmUt
c.Click OK. m'S-h'a
You will see the wire frame rendering of the spherical bumps on the Y3thW@mD05
bottom surface, and a solid color above it. The solid color is the 3D texture 9(C
Ke,
of the BEFs (brightness-enhancing films) built automatically by the utility.
