The default number of bumps is 100 (10 X 10). You need to change these +g<2t ,
parameters to match your design. Note that LightTools allows many other 5v=%pQbY
placement options, but you will use the Bezier placement option for this 9Y- Sqk+
example. 9;k_"@A6
5.On both the X Placement tab and Y Placement tab, change the Number of ny| ni\6
Bumps parameter to 300, as shown in the following figure. Click Apply after } '. l'%
each change. =4"D8 UaHr
6.Click OK to close the dialog box. t]#y } V
Note that the number of bumps is 300 X 300, which results in about 90,000 4iBp!k7
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a B@Ez,u5
manner defined by the Bezier parameterization option. Please see Chapter 5 of b !J21cg<L
the LightTools Core Module User’s Guide for more information. With the Kc glpKV`
current parameter values, the Bezier option varies the bump spacing along the =LL5E}xP
length of the light guide. The spacing in the orthogonal direction is constant. PCH&eTKN
The X and Y refer to the local coordinate system of the surface. # nwEF QA
LightTools Introductory Tutorial * 91 .vj`[?T
}a,j1r_Hl&
HAPTER 5 Introduction to Backlight Design ^<'5 V)
C 9; H R
Examining Surface Properties 'xm _oGWE
Using the methods described in previous chapters, you may want to check your OWx YV$
model before you run a simulation. z /)HJo2#
Click on various parts of the model in the 3D Design View. Or use the System ]vMr@JM-G
Navigator to select different surfaces and view their Properties. U,yU-8z/
1.In the System Navigator, click to open BottomSurface of the LightGuide, then y~w2^VN=
click Zones, and then click Texture. ZMy0iQ@
2.Select SphericalElement, and then right-click and select Properties from the mVg-z~44T
shortcut menu. The Shape tab shows you a graphical representation of the X #j-Ld{j
spherical bump shape that is the bottom of the light guide. rP>iPDf
You might be curious as to why you cannot see the 3D texture property zones you n$g g$<
defined. They are invisible by default, because drawing thousands of texture nPj%EKdY4
elements can make displaying and exploring the model somewhat slow. If you 'due'|#^
choose to make them visible, 3D textures are displayed in wireframe, even if the 3 k py3z[%
display mode is set to translucent. Wireframe rendering displays a bit faster and !jL|HwlA
shows more of the technical details. ,di'279|
92 * LightTools Introductory Tutorial dFFJw[$8w
8bLA6qmM\
HAPTER 5 Introduction to Backlight Design + pZ, RW.D
C cJd~UQ<k
1.Rotate and zoom the model to that you can see something like the illustration 1 -r# v
below: &u( eu'Q3
. Q3vC^}Dmr
2.To reveal the Property Zones: laG@SV
a.Right-click in the Design View and select View Preferences to display this BoE;,s>]NW
dialog box. 6e3s
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b.On the Visibility tab, click the Property Zone check box to turn it on. o7)< pfif
c.Click OK. Gkv<)} G
You will see the wire frame rendering of the spherical bumps on the 1O>wXq7q
bottom surface, and a solid color above it. The solid color is the 3D texture G.OAzA13!t
of the BEFs (brightness-enhancing films) built automatically by the utility.
