The default number of bumps is 100 (10 X 10). You need to change these z4 GN8:~x
parameters to match your design. Note that LightTools allows many other 6 Xzk;p
placement options, but you will use the Bezier placement option for this SD)5?{6<
example. Bu*W1w\
5.On both the X Placement tab and Y Placement tab, change the Number of !#}v:~[A
Bumps parameter to 300, as shown in the following figure. Click Apply after 7}. #Z
each change. }|w=7^1z
6.Click OK to close the dialog box. nF|#@O`1
Note that the number of bumps is 300 X 300, which results in about 90,000 sURUQ H
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a QCZ,K" y
manner defined by the Bezier parameterization option. Please see Chapter 5 of MzBfHt'Rk
the LightTools Core Module User’s Guide for more information. With the Y\ #.EVz
current parameter values, the Bezier option varies the bump spacing along the 2hjre3"?
length of the light guide. The spacing in the orthogonal direction is constant. hY\Eh.
The X and Y refer to the local coordinate system of the surface. ]>]#zu$=c
LightTools Introductory Tutorial * 91 $O;N/N:m
hNu>s
HAPTER 5 Introduction to Backlight Design [lDt0l5^
C L8,H9T #e
Examining Surface Properties _ Yb
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Using the methods described in previous chapters, you may want to check your clPZ d
model before you run a simulation. sR7{ i
Click on various parts of the model in the 3D Design View. Or use the System BN<#x@m$ ]
Navigator to select different surfaces and view their Properties. m 'G?0^Ft
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ;o~+2Fir
click Zones, and then click Texture. 8GF[)z&|P:
2.Select SphericalElement, and then right-click and select Properties from the Im0+`9Jw
shortcut menu. The Shape tab shows you a graphical representation of the +X2 i/}
spherical bump shape that is the bottom of the light guide. r'mnkg2,
You might be curious as to why you cannot see the 3D texture property zones you >oM9~7f
defined. They are invisible by default, because drawing thousands of texture wiK@o$S-
elements can make displaying and exploring the model somewhat slow. If you r|
6S
choose to make them visible, 3D textures are displayed in wireframe, even if the HJ2]Nz:
display mode is set to translucent. Wireframe rendering displays a bit faster and `? 9] '
shows more of the technical details. e')&ODQ H
92 * LightTools Introductory Tutorial W<cW;mO
)7Ho n
HAPTER 5 Introduction to Backlight Design [0**&.obz
C 886 ('
1.Rotate and zoom the model to that you can see something like the illustration Skr\a\
J
below: o2 T/IJP
. B BApL{
2.To reveal the Property Zones: Se;?j-
a.Right-click in the Design View and select View Preferences to display this Ww CK K
dialog box. 110>p
b.On the Visibility tab, click the Property Zone check box to turn it on. ul z\x2[Pf
c.Click OK. s)o ,Fi
You will see the wire frame rendering of the spherical bumps on the V1CSXY\2
bottom surface, and a solid color above it. The solid color is the 3D texture _!$Up
of the BEFs (brightness-enhancing films) built automatically by the utility.
