The default number of bumps is 100 (10 X 10). You need to change these =N01! ?{
parameters to match your design. Note that LightTools allows many other k\_>/)g
placement options, but you will use the Bezier placement option for this G;615p1
example. 6"WR}S0o
5.On both the X Placement tab and Y Placement tab, change the Number of `
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Bumps parameter to 300, as shown in the following figure. Click Apply after V BR@f<2L
each change. 'GQ1;9A57
6.Click OK to close the dialog box. ]+)z}lr8 C
Note that the number of bumps is 300 X 300, which results in about 90,000 |s|>46E
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a h *)spwF-
manner defined by the Bezier parameterization option. Please see Chapter 5 of g. f!Uc{
the LightTools Core Module User’s Guide for more information. With the gwQL9
UYx
current parameter values, the Bezier option varies the bump spacing along the @]tF RV
length of the light guide. The spacing in the orthogonal direction is constant. VA4vAF
The X and Y refer to the local coordinate system of the surface. ]7zDdI|
LightTools Introductory Tutorial * 91 `m<l8'g
R?1;'pvpa[
HAPTER 5 Introduction to Backlight Design Gh0H)
q
C /MTS>[E
Examining Surface Properties Q@%VJPLv.
Using the methods described in previous chapters, you may want to check your lT$Vv= M
model before you run a simulation. C]*9:lK
Click on various parts of the model in the 3D Design View. Or use the System k<=.1cFh
Navigator to select different surfaces and view their Properties. MUz.-YRt
1.In the System Navigator, click to open BottomSurface of the LightGuide, then D9e"E1 f+"
click Zones, and then click Texture. gqNd@tYI
2.Select SphericalElement, and then right-click and select Properties from the Z<En3^j`
shortcut menu. The Shape tab shows you a graphical representation of the K"eR 6_ k
spherical bump shape that is the bottom of the light guide. <VB
You might be curious as to why you cannot see the 3D texture property zones you h+zJ"\
defined. They are invisible by default, because drawing thousands of texture R|{AIa{}
elements can make displaying and exploring the model somewhat slow. If you `y0ZFh1>X
choose to make them visible, 3D textures are displayed in wireframe, even if the /7|u2!#Ui
display mode is set to translucent. Wireframe rendering displays a bit faster and 8gJ"7,}-'
shows more of the technical details. ~FH''}3:3
92 * LightTools Introductory Tutorial aM uc]Wy#
65N;PH59D
HAPTER 5 Introduction to Backlight Design Rb<aCX
C =Xm
[
1.Rotate and zoom the model to that you can see something like the illustration 2uS&A
\
below: ;z#D%#Ztq
. xBG&ZM4"^f
2.To reveal the Property Zones: f'Wc_ L)
a.Right-click in the Design View and select View Preferences to display this 56u'XMB?
dialog box. =r+u!~%@''
b.On the Visibility tab, click the Property Zone check box to turn it on. wED~^[] f
c.Click OK. W>dS@;E
You will see the wire frame rendering of the spherical bumps on the Slq=;TDp
bottom surface, and a solid color above it. The solid color is the 3D texture
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of the BEFs (brightness-enhancing films) built automatically by the utility.
