The default number of bumps is 100 (10 X 10). You need to change these M.))UKSF
parameters to match your design. Note that LightTools allows many other (wU<Kpt?J
placement options, but you will use the Bezier placement option for this n]?Yv E
example. G
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5.On both the X Placement tab and Y Placement tab, change the Number of |}
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Bumps parameter to 300, as shown in the following figure. Click Apply after q%%8oaEI
each change. z$$ E7i
6.Click OK to close the dialog box. 2%i_SX [
Note that the number of bumps is 300 X 300, which results in about 90,000 2W: R{dHE
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a qZACX.Hw
manner defined by the Bezier parameterization option. Please see Chapter 5 of q,3_)ZOq
the LightTools Core Module User’s Guide for more information. With the u+UtvzUC
current parameter values, the Bezier option varies the bump spacing along the losm<
length of the light guide. The spacing in the orthogonal direction is constant. ma[%,u`
The X and Y refer to the local coordinate system of the surface. je@F:5
LightTools Introductory Tutorial * 91 16ahU$@-
$$ou qLu
HAPTER 5 Introduction to Backlight Design \fIGMoy!
C _^;+_6&[
Examining Surface Properties {I0b %>r=
Using the methods described in previous chapters, you may want to check your pQAG%i^mF
model before you run a simulation. a~E@scD
Click on various parts of the model in the 3D Design View. Or use the System )zz^RB\ p
Navigator to select different surfaces and view their Properties. GTL gj'B
1.In the System Navigator, click to open BottomSurface of the LightGuide, then G66sP w
click Zones, and then click Texture. gcDo o2RE
2.Select SphericalElement, and then right-click and select Properties from the @TF^6)4f
shortcut menu. The Shape tab shows you a graphical representation of the `!WtKqr%B
spherical bump shape that is the bottom of the light guide. .'N:]G@!
You might be curious as to why you cannot see the 3D texture property zones you @zo}#.g
defined. They are invisible by default, because drawing thousands of texture s\i:;`l:=5
elements can make displaying and exploring the model somewhat slow. If you i3#To}g5V
choose to make them visible, 3D textures are displayed in wireframe, even if the V}gP'f07zy
display mode is set to translucent. Wireframe rendering displays a bit faster and n " ?It
shows more of the technical details.
uyBmGS2
92 * LightTools Introductory Tutorial )a"rj5~-
81Ixs
Qt
HAPTER 5 Introduction to Backlight Design e59P6/z
C FN jT? *
1.Rotate and zoom the model to that you can see something like the illustration n${,r
below: (1pI#H"f9
. W <.h@Rz+
2.To reveal the Property Zones: C><]o
a.Right-click in the Design View and select View Preferences to display this rP$vZ^/c
dialog box. gwVfiXR4
b.On the Visibility tab, click the Property Zone check box to turn it on. /]7FX "
c.Click OK. 5@l[!Jl0k
You will see the wire frame rendering of the spherical bumps on the :'1UX <&B
bottom surface, and a solid color above it. The solid color is the 3D texture #=@H-ZuD7
of the BEFs (brightness-enhancing films) built automatically by the utility.
