The default number of bumps is 100 (10 X 10). You need to change these z~g 7O4#
parameters to match your design. Note that LightTools allows many other UJ0Dy ` f
placement options, but you will use the Bezier placement option for this vd5"phn
3
example. J{Z-4y
5.On both the X Placement tab and Y Placement tab, change the Number of 0shNwV1z F
Bumps parameter to 300, as shown in the following figure. Click Apply after ;5* )kX
each change. ?gSk%]S/!
6.Click OK to close the dialog box. 3,K*r"=
Note that the number of bumps is 300 X 300, which results in about 90,000 {,5=U@J
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a UeRx ^
manner defined by the Bezier parameterization option. Please see Chapter 5 of P80z@!
the LightTools Core Module User’s Guide for more information. With the SZ9xj^"g
current parameter values, the Bezier option varies the bump spacing along the dwc$?Bg ,5
length of the light guide. The spacing in the orthogonal direction is constant. by {G{M`X
The X and Y refer to the local coordinate system of the surface. "~h.u
LightTools Introductory Tutorial * 91 ))n7.pB9/
Lp \%-s#5s
HAPTER 5 Introduction to Backlight Design y\
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C u+]v. Mt
Examining Surface Properties `9Qr kkG+
Using the methods described in previous chapters, you may want to check your
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model before you run a simulation. !Xwp;P=
Click on various parts of the model in the 3D Design View. Or use the System E(T6s^8
Navigator to select different surfaces and view their Properties. ?80@ +y]
1.In the System Navigator, click to open BottomSurface of the LightGuide, then >#@1
I
click Zones, and then click Texture. i\S } aCm
2.Select SphericalElement, and then right-click and select Properties from the 's{-1aW
shortcut menu. The Shape tab shows you a graphical representation of the
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spherical bump shape that is the bottom of the light guide. (BC3[R@/l
You might be curious as to why you cannot see the 3D texture property zones you JlsR P
defined. They are invisible by default, because drawing thousands of texture *JG?^G"l
elements can make displaying and exploring the model somewhat slow. If you S.+)">buH
choose to make them visible, 3D textures are displayed in wireframe, even if the i3.8m =>
display mode is set to translucent. Wireframe rendering displays a bit faster and r\Wp\LfY&{
shows more of the technical details. {Izg1 N
92 * LightTools Introductory Tutorial tR5zlm (}
7"f$;CN ?~
HAPTER 5 Introduction to Backlight Design m_H$fioha,
C }6]V*Kn,
1.Rotate and zoom the model to that you can see something like the illustration s)HbBt-
below: #R|M(Z">q
. n=RAE^[ M
2.To reveal the Property Zones: r^P}xGGK
a.Right-click in the Design View and select View Preferences to display this {6<7 M
dialog box. *seKph+' c
b.On the Visibility tab, click the Property Zone check box to turn it on. 66=6;77
c.Click OK. z9$x9u
You will see the wire frame rendering of the spherical bumps on the l;L&ijTQD
bottom surface, and a solid color above it. The solid color is the 3D texture #VC ^><)3
of the BEFs (brightness-enhancing films) built automatically by the utility.
