The default number of bumps is 100 (10 X 10). You need to change these COa" z g
parameters to match your design. Note that LightTools allows many other w"O^C R)
placement options, but you will use the Bezier placement option for this io$!z=W
example. a 8Jn.!
5.On both the X Placement tab and Y Placement tab, change the Number of S& % G B
Bumps parameter to 300, as shown in the following figure. Click Apply after DUxj^,mf,
each change. &C+pen) Z
6.Click OK to close the dialog box. LuB-9[^<
Note that the number of bumps is 300 X 300, which results in about 90,000 uFIr.U$V
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 7W6tz\Y
manner defined by the Bezier parameterization option. Please see Chapter 5 of :Uf\r
`a9
the LightTools Core Module User’s Guide for more information. With the Ax4nx!W,
current parameter values, the Bezier option varies the bump spacing along the V&E)4KBOs
length of the light guide. The spacing in the orthogonal direction is constant. 0S0 ?\r
The X and Y refer to the local coordinate system of the surface. bBBW7',[ a
LightTools Introductory Tutorial * 91 'dp3 >4
Lc!%
3,#.
HAPTER 5 Introduction to Backlight Design vJT
%ET
C c@% :aiEl
Examining Surface Properties |~Hlv^6H
Using the methods described in previous chapters, you may want to check your +v3@WdLcD
model before you run a simulation. iXt >!f*
Click on various parts of the model in the 3D Design View. Or use the System 0Kxc$c
Navigator to select different surfaces and view their Properties. .A Of-a
1.In the System Navigator, click to open BottomSurface of the LightGuide, then GQOz\ic
click Zones, and then click Texture. &
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2.Select SphericalElement, and then right-click and select Properties from the q/[)Z
@&(
shortcut menu. The Shape tab shows you a graphical representation of the :yo tpa
spherical bump shape that is the bottom of the light guide. PK@hf[YHe
You might be curious as to why you cannot see the 3D texture property zones you wIIxs_2Q0c
defined. They are invisible by default, because drawing thousands of texture f:gXXigY,
elements can make displaying and exploring the model somewhat slow. If you AXhV#nZt0
choose to make them visible, 3D textures are displayed in wireframe, even if the .V 9/0
display mode is set to translucent. Wireframe rendering displays a bit faster and %Uj7 g>
shows more of the technical details. Y#EM]x5!=
92 * LightTools Introductory Tutorial ,c#=qb8""
.olDmFQD
HAPTER 5 Introduction to Backlight Design 4hep1Kz%
C Np=IZ npt
1.Rotate and zoom the model to that you can see something like the illustration 8r7~ >p~
below: ^~k2(DLk
. FOxMt;|M
2.To reveal the Property Zones: L, L>cmpM
a.Right-click in the Design View and select View Preferences to display this !fXw X3B
dialog box. )54;YK
b.On the Visibility tab, click the Property Zone check box to turn it on. #;?j]npg]
c.Click OK. ^fT|Wm<
You will see the wire frame rendering of the spherical bumps on the w~A{]s{ 4
bottom surface, and a solid color above it. The solid color is the 3D texture \*Ro a& <!
of the BEFs (brightness-enhancing films) built automatically by the utility.
