The default number of bumps is 100 (10 X 10). You need to change these 2WS*c7Ct
parameters to match your design. Note that LightTools allows many other u UjjAGZ
placement options, but you will use the Bezier placement option for this $ 6n
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example. X 2V+cre
5.On both the X Placement tab and Y Placement tab, change the Number of O\Huj=
Bumps parameter to 300, as shown in the following figure. Click Apply after 'u.Dt*.Uq
each change. OP\jO DX
6.Click OK to close the dialog box. :|(YlNUv
Note that the number of bumps is 300 X 300, which results in about 90,000 ug,AvHEnB
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a bo#xqSGQ
manner defined by the Bezier parameterization option. Please see Chapter 5 of 0f5 ag&
the LightTools Core Module User’s Guide for more information. With the ]0>
current parameter values, the Bezier option varies the bump spacing along the vE fj3+e
length of the light guide. The spacing in the orthogonal direction is constant. Lyc6nP; F
The X and Y refer to the local coordinate system of the surface. N7s0Ua'-v
LightTools Introductory Tutorial * 91 IFBt#]l0
<Z.`X7]Uk
HAPTER 5 Introduction to Backlight Design .'=S1|_(
C d*tWFr|J-
Examining Surface Properties vP,pK=5
Using the methods described in previous chapters, you may want to check your N~]qQ oj,
model before you run a simulation. w!"A$+~
Click on various parts of the model in the 3D Design View. Or use the System :? )!yI
Navigator to select different surfaces and view their Properties. VKPE oy8H
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 9"^ib9M
click Zones, and then click Texture. ,esEh5=Ir
2.Select SphericalElement, and then right-click and select Properties from the qoZi1,i'
shortcut menu. The Shape tab shows you a graphical representation of the h
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spherical bump shape that is the bottom of the light guide. yhg GvyD
You might be curious as to why you cannot see the 3D texture property zones you P
DY :?/
defined. They are invisible by default, because drawing thousands of texture fYuSfB+<
elements can make displaying and exploring the model somewhat slow. If you |]<#![!h#
choose to make them visible, 3D textures are displayed in wireframe, even if the ,~cK]!:>s
display mode is set to translucent. Wireframe rendering displays a bit faster and P?q HzNGi7
shows more of the technical details. 3chx 4
92 * LightTools Introductory Tutorial _xAru9=n^
X_'tgP9
HAPTER 5 Introduction to Backlight Design r ??_2>Q
C O^\:J 2I(
1.Rotate and zoom the model to that you can see something like the illustration %( OP
[
below: AO`@ &e]o
. hbYstK;]Z
2.To reveal the Property Zones: z x<t{e7
a.Right-click in the Design View and select View Preferences to display this T%.Y so{
dialog box. =p@2[Uo
b.On the Visibility tab, click the Property Zone check box to turn it on. jS]Sa qd
c.Click OK. %!iqJ)*~
You will see the wire frame rendering of the spherical bumps on the !F s$W
bottom surface, and a solid color above it. The solid color is the 3D texture 5@l5exuG*m
of the BEFs (brightness-enhancing films) built automatically by the utility.
