The default number of bumps is 100 (10 X 10). You need to change these +8BH%f}X
parameters to match your design. Note that LightTools allows many other NsJUruN
placement options, but you will use the Bezier placement option for this N s1u0$fg
example. +(|T\%$DT
5.On both the X Placement tab and Y Placement tab, change the Number of hsfVKlw-
Bumps parameter to 300, as shown in the following figure. Click Apply after `?Y/:4
each change. 9 .%{M#j
6.Click OK to close the dialog box. dnNc,l&g
Note that the number of bumps is 300 X 300, which results in about 90,000 eU{=x$o6S
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a VnIJ$5Y
manner defined by the Bezier parameterization option. Please see Chapter 5 of t5eux&C
the LightTools Core Module User’s Guide for more information. With the vn,L),"=
current parameter values, the Bezier option varies the bump spacing along the ;'vY^I 8-L
length of the light guide. The spacing in the orthogonal direction is constant. 0kC!v ,
The X and Y refer to the local coordinate system of the surface. MR+n dB<
LightTools Introductory Tutorial * 91 yiI&>J))
tb@/E
HAPTER 5 Introduction to Backlight Design *5|\if\
C *AxKV5[H
Examining Surface Properties 4H1s"mP<
Using the methods described in previous chapters, you may want to check your XM8C {I1
model before you run a simulation. y4shW|>5_
Click on various parts of the model in the 3D Design View. Or use the System pV>/ "K
Navigator to select different surfaces and view their Properties. }A2@1TTPX
1.In the System Navigator, click to open BottomSurface of the LightGuide, then O[`n{Vl/
click Zones, and then click Texture. P5aHLNit
2.Select SphericalElement, and then right-click and select Properties from the uM qo)J@s
shortcut menu. The Shape tab shows you a graphical representation of the o .k#|q
spherical bump shape that is the bottom of the light guide. eKLxNw5
You might be curious as to why you cannot see the 3D texture property zones you //6m2a
defined. They are invisible by default, because drawing thousands of texture RHB>svT^K>
elements can make displaying and exploring the model somewhat slow. If you Ye1P5+W(
choose to make them visible, 3D textures are displayed in wireframe, even if the f#^%\K:YYR
display mode is set to translucent. Wireframe rendering displays a bit faster and ICV67(Ui
shows more of the technical details. nTYqZ lI,
92 * LightTools Introductory Tutorial ,L_p"A
=ohd L_6
HAPTER 5 Introduction to Backlight Design ]vu' +F$
C OjZ+gl}
1.Rotate and zoom the model to that you can see something like the illustration ikm4Y`c
below: MK=:L
. 1S_ KX.
2.To reveal the Property Zones: ^s24f?3
a.Right-click in the Design View and select View Preferences to display this Wd dU|-W
dialog box. 0>.'w\,87B
b.On the Visibility tab, click the Property Zone check box to turn it on. f Z \Ev%F
c.Click OK. Hj2P|;2S
You will see the wire frame rendering of the spherical bumps on the $RF"m"
bottom surface, and a solid color above it. The solid color is the 3D texture /nC"'d(#
of the BEFs (brightness-enhancing films) built automatically by the utility.
