The default number of bumps is 100 (10 X 10). You need to change these KTzkJx
parameters to match your design. Note that LightTools allows many other mxxuD"5
placement options, but you will use the Bezier placement option for this = ^L?Sgg
example. 2wKW17wj,
5.On both the X Placement tab and Y Placement tab, change the Number of .&R j2 d
Bumps parameter to 300, as shown in the following figure. Click Apply after & N^^[
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each change. iR`c/
6.Click OK to close the dialog box. p=-:Z?EW1
Note that the number of bumps is 300 X 300, which results in about 90,000 W\W|v? r
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a \KpSYX1
manner defined by the Bezier parameterization option. Please see Chapter 5 of EoOB0zo}Y+
the LightTools Core Module User’s Guide for more information. With the
& 1k2J
current parameter values, the Bezier option varies the bump spacing along the a`:ag~op@&
length of the light guide. The spacing in the orthogonal direction is constant. U:[ #n5g
The X and Y refer to the local coordinate system of the surface. _#2AdhCu
LightTools Introductory Tutorial * 91 OB&lq. r
ED>T2.:{
HAPTER 5 Introduction to Backlight Design l'#P:eW
C fQtV-\Bc
Examining Surface Properties r'C(+E (
Using the methods described in previous chapters, you may want to check your *;]j#0
model before you run a simulation. X=Th
Click on various parts of the model in the 3D Design View. Or use the System \@ j YY~
Navigator to select different surfaces and view their Properties. Gx.iZOOH/
1.In the System Navigator, click to open BottomSurface of the LightGuide, then = @UgCu>=
click Zones, and then click Texture. YH%aPsi
2.Select SphericalElement, and then right-click and select Properties from the j!oD9&W4~
shortcut menu. The Shape tab shows you a graphical representation of the w &F/P]1
spherical bump shape that is the bottom of the light guide. 8D[,z 7n
You might be curious as to why you cannot see the 3D texture property zones you }/{G
defined. They are invisible by default, because drawing thousands of texture HRPNZ!B
elements can make displaying and exploring the model somewhat slow. If you f T&>L
choose to make them visible, 3D textures are displayed in wireframe, even if the ELlTR/NW
display mode is set to translucent. Wireframe rendering displays a bit faster and XKTX~:
shows more of the technical details. { 4(E
@
92 * LightTools Introductory Tutorial b<N962 q$q
e b uR-9
HAPTER 5 Introduction to Backlight Design @H?_x/qBT
C _ zh>q4M
1.Rotate and zoom the model to that you can see something like the illustration <Fc @T4Q,
below: lM<SoC;[
. m3La;%aA0
2.To reveal the Property Zones: t mCm54
a.Right-click in the Design View and select View Preferences to display this 0."TSe83\
dialog box. [^U#ic>cT
b.On the Visibility tab, click the Property Zone check box to turn it on. kDrqV{_
c.Click OK. BV9 %|
You will see the wire frame rendering of the spherical bumps on the AhjUFz
bottom surface, and a solid color above it. The solid color is the 3D texture 7i,Z c]
of the BEFs (brightness-enhancing films) built automatically by the utility.
