The default number of bumps is 100 (10 X 10). You need to change these =1@LMIi5x
parameters to match your design. Note that LightTools allows many other PjH'5Y
placement options, but you will use the Bezier placement option for this 9\c]I0)3p
example. 3bYjW=_hA
5.On both the X Placement tab and Y Placement tab, change the Number of c+
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Bumps parameter to 300, as shown in the following figure. Click Apply after B(k tIy
each change. 5OzEY7K)
6.Click OK to close the dialog box. }>d
Note that the number of bumps is 300 X 300, which results in about 90,000 + @ ~WKa
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a m(*rMO>_
manner defined by the Bezier parameterization option. Please see Chapter 5 of `j(._`8%a
the LightTools Core Module User’s Guide for more information. With the ] Yw$A
current parameter values, the Bezier option varies the bump spacing along the X%3?sH
length of the light guide. The spacing in the orthogonal direction is constant. 8'%m!
The X and Y refer to the local coordinate system of the surface. GEA1y^b6"
LightTools Introductory Tutorial * 91 F"UI=7:o
9@yF7
HAPTER 5 Introduction to Backlight Design JWI Y0iP
C
-0x Q'1I
Examining Surface Properties m|F1_Ggz
Using the methods described in previous chapters, you may want to check your 8-B7_GoJ+B
model before you run a simulation. 3% 5a&b
Click on various parts of the model in the 3D Design View. Or use the System X6r0+D5AvB
Navigator to select different surfaces and view their Properties. 6(rN(C
1.In the System Navigator, click to open BottomSurface of the LightGuide, then YO$D-
click Zones, and then click Texture. N+@ Ff3M
2.Select SphericalElement, and then right-click and select Properties from the t>/ x-{bH\
shortcut menu. The Shape tab shows you a graphical representation of the brs`R#e \
spherical bump shape that is the bottom of the light guide. b5LToy:
You might be curious as to why you cannot see the 3D texture property zones you 7J!s"|VS
defined. They are invisible by default, because drawing thousands of texture 5l
3PA G
elements can make displaying and exploring the model somewhat slow. If you f? 51sr
choose to make them visible, 3D textures are displayed in wireframe, even if the [&P F ;)i
display mode is set to translucent. Wireframe rendering displays a bit faster and Dzf\m>H[
shows more of the technical details. 3ie
k >'T
92 * LightTools Introductory Tutorial !Yv_V]u=
uVCH<6Cp
HAPTER 5 Introduction to Backlight Design oV0T
C ]i $0 s
1.Rotate and zoom the model to that you can see something like the illustration bo/9k 4N3
below: J\Pb/9M/
. Xt<1b
2.To reveal the Property Zones: :sJ7Wok6~
a.Right-click in the Design View and select View Preferences to display this . i
I{
dialog box. 9<.O=-1~
b.On the Visibility tab, click the Property Zone check box to turn it on. Z K+F<}
c.Click OK. suwR`2
You will see the wire frame rendering of the spherical bumps on the 3N Ln}
bottom surface, and a solid color above it. The solid color is the 3D texture c
'wRGMP
of the BEFs (brightness-enhancing films) built automatically by the utility.
