The default number of bumps is 100 (10 X 10). You need to change these *><]
[|Y@H
parameters to match your design. Note that LightTools allows many other 5h20\b?=$
placement options, but you will use the Bezier placement option for this Q&F@[k
example. wkd591d*
5.On both the X Placement tab and Y Placement tab, change the Number of aMz%H|/$
Bumps parameter to 300, as shown in the following figure. Click Apply after OEAF.
each change. {b#c0>.8-
6.Click OK to close the dialog box. ;UWdT]>!?
Note that the number of bumps is 300 X 300, which results in about 90,000 }"cb^3
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 8D+OF 6CM
manner defined by the Bezier parameterization option. Please see Chapter 5 of L>@6lhD)x
the LightTools Core Module User’s Guide for more information. With the m,.d< **
current parameter values, the Bezier option varies the bump spacing along the 4&$G;?#W2
length of the light guide. The spacing in the orthogonal direction is constant. %@rh\Z
The X and Y refer to the local coordinate system of the surface. PD/~@OsxU
LightTools Introductory Tutorial * 91 !'[sV^ds
<R!qOQI
HAPTER 5 Introduction to Backlight Design GN~:rdd
C Cu|n?Uk
Examining Surface Properties _6(zG.Fg
Using the methods described in previous chapters, you may want to check your 2ag]p
model before you run a simulation. c9'#G>&h~^
Click on various parts of the model in the 3D Design View. Or use the System %3C,jg
Navigator to select different surfaces and view their Properties. n"MFC
1.In the System Navigator, click to open BottomSurface of the LightGuide, then c?opVbJB\
click Zones, and then click Texture. \Xkx`C
2.Select SphericalElement, and then right-click and select Properties from the [6-l6W
shortcut menu. The Shape tab shows you a graphical representation of the RCmPZ
spherical bump shape that is the bottom of the light guide. g^]Q*EBa
You might be curious as to why you cannot see the 3D texture property zones you KlrKGmy,)
defined. They are invisible by default, because drawing thousands of texture Cu`ZgKLQ
elements can make displaying and exploring the model somewhat slow. If you \XpPb{:>
choose to make them visible, 3D textures are displayed in wireframe, even if the e~-Dk .i
display mode is set to translucent. Wireframe rendering displays a bit faster and ZU:gNO0
shows more of the technical details. $[>wJXj3R
92 * LightTools Introductory Tutorial nTHP~]
2R5]UR S
HAPTER 5 Introduction to Backlight Design HQE#O4
C F`ihw[
Wn
1.Rotate and zoom the model to that you can see something like the illustration i>rn!?b
below: qt1#P
. ZPMEN,Dw
2.To reveal the Property Zones: oZ8SEC"]
a.Right-click in the Design View and select View Preferences to display this =-q)I[4#
dialog box. G!Uq#l>
b.On the Visibility tab, click the Property Zone check box to turn it on. QUe.vb^O
c.Click OK. R]r~TJ o
You will see the wire frame rendering of the spherical bumps on the :WxMv~e{U
bottom surface, and a solid color above it. The solid color is the 3D texture gWlmQl
of the BEFs (brightness-enhancing films) built automatically by the utility.