The default number of bumps is 100 (10 X 10). You need to change these `YE= B{q
parameters to match your design. Note that LightTools allows many other z,2*3Be6V
placement options, but you will use the Bezier placement option for this eMmNQRmH
example.
kN8B,
5.On both the X Placement tab and Y Placement tab, change the Number of 1 ,Mm+_)B
Bumps parameter to 300, as shown in the following figure. Click Apply after 2 k^rZ^^"
each change. iF837ng5
6.Click OK to close the dialog box. M+HhTW;I=
Note that the number of bumps is 300 X 300, which results in about 90,000 >D}|'. &
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a kS9;Tj cx
manner defined by the Bezier parameterization option. Please see Chapter 5 of z9g6%RbwX
the LightTools Core Module User’s Guide for more information. With the )Ho"b
current parameter values, the Bezier option varies the bump spacing along the 4 dLnX3 v
length of the light guide. The spacing in the orthogonal direction is constant. M6^
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The X and Y refer to the local coordinate system of the surface. ]FIIs58IM
LightTools Introductory Tutorial * 91 K9p<PLy+
NqNU:_}
HAPTER 5 Introduction to Backlight Design )cZHBG.0H
C D_ ~;!^
Examining Surface Properties N}ND()bf
Using the methods described in previous chapters, you may want to check your $e--"@[Y
model before you run a simulation. /~ f[>#
Click on various parts of the model in the 3D Design View. Or use the System Z~8%bfpe
Navigator to select different surfaces and view their Properties. H-v[ShE
1.In the System Navigator, click to open BottomSurface of the LightGuide, then B7|%N=S%/
click Zones, and then click Texture. #W3H;'~/5
2.Select SphericalElement, and then right-click and select Properties from the r `n|fD.
shortcut menu. The Shape tab shows you a graphical representation of the -o`K/f}d
spherical bump shape that is the bottom of the light guide. u~ Po5W/i
You might be curious as to why you cannot see the 3D texture property zones you S<cz2FlV
defined. They are invisible by default, because drawing thousands of texture % -A cA
elements can make displaying and exploring the model somewhat slow. If you Jvsy
6R
choose to make them visible, 3D textures are displayed in wireframe, even if the 1r} i[5
display mode is set to translucent. Wireframe rendering displays a bit faster and I2*(v%.-
shows more of the technical details. 7iwck. *
92 * LightTools Introductory Tutorial 2 rf8)8':
~ho,bwJM[T
HAPTER 5 Introduction to Backlight Design ' -Cx -=
C ytjZ7J['{
1.Rotate and zoom the model to that you can see something like the illustration t!6uz
below: <2&qIvHL
. <#nU 06 fN
2.To reveal the Property Zones: . !Z5 A9^
a.Right-click in the Design View and select View Preferences to display this p5vQ.Ni*\-
dialog box. #0uu19+}
b.On the Visibility tab, click the Property Zone check box to turn it on. X1a~l|$h
c.Click OK. a{^z= =
You will see the wire frame rendering of the spherical bumps on the A:GqR;;"x>
bottom surface, and a solid color above it. The solid color is the 3D texture CLV T5pj='
of the BEFs (brightness-enhancing films) built automatically by the utility.
