The default number of bumps is 100 (10 X 10). You need to change these sB_o
HUMH6
parameters to match your design. Note that LightTools allows many other GV1\8OG7
placement options, but you will use the Bezier placement option for this ~1pJQ)!zlq
example. />XfK,c-
5.On both the X Placement tab and Y Placement tab, change the Number of :b;2iBVB
Bumps parameter to 300, as shown in the following figure. Click Apply after 13.v5 v,l
each change. .Lo$uKsW$l
6.Click OK to close the dialog box. Qw^nN(K!>
Note that the number of bumps is 300 X 300, which results in about 90,000 |EaGKC(
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a -vI?b#
manner defined by the Bezier parameterization option. Please see Chapter 5 of -gh',)R
the LightTools Core Module User’s Guide for more information. With the -[s*R% w
current parameter values, the Bezier option varies the bump spacing along the j-ugsV`2=*
length of the light guide. The spacing in the orthogonal direction is constant. L1 `^~m|
The X and Y refer to the local coordinate system of the surface. ??{ (.`}R~
LightTools Introductory Tutorial * 91 mSAuS )YD
StWDNAf)
HAPTER 5 Introduction to Backlight Design 4x=rew>Ew
C sMli! u
Examining Surface Properties ^aDos9Sy V
Using the methods described in previous chapters, you may want to check your jK\2y|&&c
model before you run a simulation. it\{#rb=4
Click on various parts of the model in the 3D Design View. Or use the System ]y$D@/L@
Navigator to select different surfaces and view their Properties. BD,JBu]
1.In the System Navigator, click to open BottomSurface of the LightGuide, then z-uJ+SA
click Zones, and then click Texture. _%!C;`3Y
2.Select SphericalElement, and then right-click and select Properties from the {$>*~.Wu
shortcut menu. The Shape tab shows you a graphical representation of the Wt"@?#L
spherical bump shape that is the bottom of the light guide. gE JmMh
You might be curious as to why you cannot see the 3D texture property zones you knpb$eX 4
defined. They are invisible by default, because drawing thousands of texture [9a0J):w{
elements can make displaying and exploring the model somewhat slow. If you SxC$EQ gL
choose to make them visible, 3D textures are displayed in wireframe, even if the [ X)+(-J
display mode is set to translucent. Wireframe rendering displays a bit faster and j DcE_55o
shows more of the technical details. @g[p>t> *
92 * LightTools Introductory Tutorial j*Q/vY!T
5?k_Q"~
HAPTER 5 Introduction to Backlight Design e}f!zA
C |A 7Yv
1.Rotate and zoom the model to that you can see something like the illustration M9]O!{ sq
below: hT ^6Ifm
. @fT*fv
2.To reveal the Property Zones: AZorz Q]s
a.Right-click in the Design View and select View Preferences to display this x 3#1
dialog box. v*Qo bI
b.On the Visibility tab, click the Property Zone check box to turn it on. Iqe4O~)
c.Click OK. /J3e[?78u
You will see the wire frame rendering of the spherical bumps on the Q <^'v>~n
bottom surface, and a solid color above it. The solid color is the 3D texture {8Hrb^8!
of the BEFs (brightness-enhancing films) built automatically by the utility.
