The default number of bumps is 100 (10 X 10). You need to change these g3vR\?c`
parameters to match your design. Note that LightTools allows many other |aS272'
placement options, but you will use the Bezier placement option for this [ih^VlZ
example. lWk/vj<5
5.On both the X Placement tab and Y Placement tab, change the Number of F z@9
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Bumps parameter to 300, as shown in the following figure. Click Apply after ?4YLt|sn
each change. .%+y_.l
6.Click OK to close the dialog box. P?j ;&@$^e
Note that the number of bumps is 300 X 300, which results in about 90,000 J42/S [Rt
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a FZ=xy[q]~
manner defined by the Bezier parameterization option. Please see Chapter 5 of &[y+WrGG
the LightTools Core Module User’s Guide for more information. With the BKd?%V8:Q
current parameter values, the Bezier option varies the bump spacing along the CsiRM8
length of the light guide. The spacing in the orthogonal direction is constant. UKp^TW1^
The X and Y refer to the local coordinate system of the surface. *w[ 0uQL5Z
LightTools Introductory Tutorial * 91 o'|B|oZ
I@:" Qee
HAPTER 5 Introduction to Backlight Design $9?<mP2-*
C wg]VG,
Examining Surface Properties #7p !xf^
Using the methods described in previous chapters, you may want to check your -s9()K(vZG
model before you run a simulation. WXe]Q bg
Click on various parts of the model in the 3D Design View. Or use the System P$*9Z@
Navigator to select different surfaces and view their Properties. ]Yk)A.y
1.In the System Navigator, click to open BottomSurface of the LightGuide, then | ?4NlB6
click Zones, and then click Texture. L4or*C^3
2.Select SphericalElement, and then right-click and select Properties from the *b\&R%6dR
shortcut menu. The Shape tab shows you a graphical representation of the o8u;2gZx
spherical bump shape that is the bottom of the light guide. o4nDjFhh
You might be curious as to why you cannot see the 3D texture property zones you +PKd
</*]
defined. They are invisible by default, because drawing thousands of texture <j:@ iP
elements can make displaying and exploring the model somewhat slow. If you ;2l|0 :
choose to make them visible, 3D textures are displayed in wireframe, even if the FPu kV^
display mode is set to translucent. Wireframe rendering displays a bit faster and ].Xh=7&2{
shows more of the technical details. )w,<XJhg`
92 * LightTools Introductory Tutorial |H>;a@2d
Nf)$K'/
HAPTER 5 Introduction to Backlight Design W}M 3z
C 8\Hz FB
1.Rotate and zoom the model to that you can see something like the illustration %'.3t|zH
below: =TJ9Gr/R&:
. e@ 7UL|12
2.To reveal the Property Zones: -mLS\TF S
a.Right-click in the Design View and select View Preferences to display this 0HN%3AG]
dialog box. qIvnPaYW
b.On the Visibility tab, click the Property Zone check box to turn it on. $0|`h)&
c.Click OK. pKaU
[1x?%
You will see the wire frame rendering of the spherical bumps on the u9 N /9
bottom surface, and a solid color above it. The solid color is the 3D texture =:'\wx
X
of the BEFs (brightness-enhancing films) built automatically by the utility.
