The default number of bumps is 100 (10 X 10). You need to change these i1Y< [s
parameters to match your design. Note that LightTools allows many other c Hnd
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placement options, but you will use the Bezier placement option for this )0=H)k0
example. _iu^VK,}
5.On both the X Placement tab and Y Placement tab, change the Number of V@`%k] k
Bumps parameter to 300, as shown in the following figure. Click Apply after /K<>OyR?
each change. k:&B
b "
6.Click OK to close the dialog box. )
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Note that the number of bumps is 300 X 300, which results in about 90,000 IY hn*
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a - R`nitf
manner defined by the Bezier parameterization option. Please see Chapter 5 of d\t A1&k71
the LightTools Core Module User’s Guide for more information. With the Uu|R]azbO
current parameter values, the Bezier option varies the bump spacing along the /^`d o3a }
length of the light guide. The spacing in the orthogonal direction is constant. W Qe Q`pM
The X and Y refer to the local coordinate system of the surface. PE6ZzxR|U<
LightTools Introductory Tutorial * 91 e )]
` Z ci <
HAPTER 5 Introduction to Backlight Design x(:alG%#
C (?P\;yDG
Examining Surface Properties 1Q$/L+uJ5
Using the methods described in previous chapters, you may want to check your WT1d'@LY
model before you run a simulation. qh6Q#s>tH
Click on various parts of the model in the 3D Design View. Or use the System ?%b#FXA
Navigator to select different surfaces and view their Properties. gc W'
1.In the System Navigator, click to open BottomSurface of the LightGuide, then [`1@`5SL-
click Zones, and then click Texture. mD,fxm{G
2.Select SphericalElement, and then right-click and select Properties from the xBE}/F$ 45
shortcut menu. The Shape tab shows you a graphical representation of the cfHtUv
spherical bump shape that is the bottom of the light guide. +y 48.5
You might be curious as to why you cannot see the 3D texture property zones you QPB ^%8
defined. They are invisible by default, because drawing thousands of texture 0 l+Jq
elements can make displaying and exploring the model somewhat slow. If you 6N/6WrQEeg
choose to make them visible, 3D textures are displayed in wireframe, even if the y`pgJO
display mode is set to translucent. Wireframe rendering displays a bit faster and N\ fj[?f[
shows more of the technical details. tl = e!
92 * LightTools Introductory Tutorial ?4_ME3$t
Hr*xA x
HAPTER 5 Introduction to Backlight Design >ni0:^vp
C ixB"6O
1.Rotate and zoom the model to that you can see something like the illustration Z 3-=TN
below: R^ yh,
. ZU l-&P_X
2.To reveal the Property Zones: n -xCaq
a.Right-click in the Design View and select View Preferences to display this L!Gpk) }[i
dialog box. ziv *4
b.On the Visibility tab, click the Property Zone check box to turn it on. bDq<]h_7
c.Click OK. Yd<9Y\W%?
You will see the wire frame rendering of the spherical bumps on the ,S&p\(r.
bottom surface, and a solid color above it. The solid color is the 3D texture ,be$ ~7qS
of the BEFs (brightness-enhancing films) built automatically by the utility.
