The default number of bumps is 100 (10 X 10). You need to change these AD\<}/3U
parameters to match your design. Note that LightTools allows many other j/<y
placement options, but you will use the Bezier placement option for this hU
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example. Xa@ wN/"F
5.On both the X Placement tab and Y Placement tab, change the Number of 7LwS =yP
Bumps parameter to 300, as shown in the following figure. Click Apply after yj~"C$s
each change. `#rfp
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6.Click OK to close the dialog box. (U_Q7hj a?
Note that the number of bumps is 300 X 300, which results in about 90,000 'pY;] ^M
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ~
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manner defined by the Bezier parameterization option. Please see Chapter 5 of Z0eBx
the LightTools Core Module User’s Guide for more information. With the mi<D
bnou
current parameter values, the Bezier option varies the bump spacing along the ik *)j
length of the light guide. The spacing in the orthogonal direction is constant. ,)$KS*f"*z
The X and Y refer to the local coordinate system of the surface. ;8i L,^.A
LightTools Introductory Tutorial * 91 F2$bUY
yXA f
HAPTER 5 Introduction to Backlight Design Sx)Il~ x
C qffSq](D.
Examining Surface Properties %vt SeJ
Using the methods described in previous chapters, you may want to check your 7V {"!V5
model before you run a simulation. 9S%gVNxn
Click on various parts of the model in the 3D Design View. Or use the System 1=Zw=ufqV
Navigator to select different surfaces and view their Properties. \( <{)GpBi
1.In the System Navigator, click to open BottomSurface of the LightGuide, then
9JV
3
click Zones, and then click Texture. V; -.38py
2.Select SphericalElement, and then right-click and select Properties from the n u8j_grW
shortcut menu. The Shape tab shows you a graphical representation of the +.]}f}Y
spherical bump shape that is the bottom of the light guide. cXcx_-
You might be curious as to why you cannot see the 3D texture property zones you : W^\
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defined. They are invisible by default, because drawing thousands of texture $p3Wjf:bH
elements can make displaying and exploring the model somewhat slow. If you TucAs 0-bF
choose to make them visible, 3D textures are displayed in wireframe, even if the B21AcE
display mode is set to translucent. Wireframe rendering displays a bit faster and ^D;D8A.
shows more of the technical details. KVM@//:{
92 * LightTools Introductory Tutorial =O#AOw`
nRB>[l G
HAPTER 5 Introduction to Backlight Design (}X?v`Y^W
C $xtE+EV.p
1.Rotate and zoom the model to that you can see something like the illustration g#b u_E61B
below: bo;pj$eR3R
. i!W8Q$V
2.To reveal the Property Zones: A>t!/_"
a.Right-click in the Design View and select View Preferences to display this R96o8#7Uv
dialog box. SxZ^ "\H
b.On the Visibility tab, click the Property Zone check box to turn it on. O)xEF~DaD
c.Click OK. @'r`(o3z!Z
You will see the wire frame rendering of the spherical bumps on the NhoS7 y(
bottom surface, and a solid color above it. The solid color is the 3D texture ?4>y2!OC9
of the BEFs (brightness-enhancing films) built automatically by the utility.
