The default number of bumps is 100 (10 X 10). You need to change these r>o6}Mx$
parameters to match your design. Note that LightTools allows many other 3.Kdz}
placement options, but you will use the Bezier placement option for this *ni|I@ 8
example. #u^d3
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5.On both the X Placement tab and Y Placement tab, change the Number of J$[ Vm%56
Bumps parameter to 300, as shown in the following figure. Click Apply after jRc#>;dN
each change. ~ .-'pdz%
6.Click OK to close the dialog box. Gx($q;8
Note that the number of bumps is 300 X 300, which results in about 90,000 cyyFIJj]
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a GYO"1PM
manner defined by the Bezier parameterization option. Please see Chapter 5 of xH uyfQLk
the LightTools Core Module User’s Guide for more information. With the |1R @Jz`
current parameter values, the Bezier option varies the bump spacing along the O8%/Id
length of the light guide. The spacing in the orthogonal direction is constant. .CY kb8hF
The X and Y refer to the local coordinate system of the surface. ]vMft?
LightTools Introductory Tutorial * 91 ?*= Jq
W#7c` nm
HAPTER 5 Introduction to Backlight Design J%' |IwA
C u#<]>EtbB
Examining Surface Properties ]LjW,b"
Using the methods described in previous chapters, you may want to check your r>\.b{wI
model before you run a simulation. `'`XB0vb
Click on various parts of the model in the 3D Design View. Or use the System v80 e]M!
Navigator to select different surfaces and view their Properties. '"Gi&:*nQ<
1.In the System Navigator, click to open BottomSurface of the LightGuide, then e6Y0G,K
click Zones, and then click Texture. t*#T~3p
2.Select SphericalElement, and then right-click and select Properties from the ::6@mFL R
shortcut menu. The Shape tab shows you a graphical representation of the D@e:Fu1\R
spherical bump shape that is the bottom of the light guide. KMa?2cJH#
You might be curious as to why you cannot see the 3D texture property zones you 3;A AC (X
defined. They are invisible by default, because drawing thousands of texture ?FyA2q!
elements can make displaying and exploring the model somewhat slow. If you =zdRoXBY[b
choose to make them visible, 3D textures are displayed in wireframe, even if the ,
{^g}d8
display mode is set to translucent. Wireframe rendering displays a bit faster and p{U ro!J,K
shows more of the technical details. xp =
]J UQ
92 * LightTools Introductory Tutorial } 2KuY\5\i
:v`o="
HAPTER 5 Introduction to Backlight Design h1$,
C \oyr[so(i
1.Rotate and zoom the model to that you can see something like the illustration u- ,=C/iU
below: ^<c?I re
. uP.3(n[&
2.To reveal the Property Zones: t V</ x0#
a.Right-click in the Design View and select View Preferences to display this (Q&Z/Fe
dialog box. V0>,Kxk
b.On the Visibility tab, click the Property Zone check box to turn it on. >U z3F7nHi
c.Click OK. wXe.z LQ
You will see the wire frame rendering of the spherical bumps on the t P3Upw"U
bottom surface, and a solid color above it. The solid color is the 3D texture raCxHY
of the BEFs (brightness-enhancing films) built automatically by the utility.
