The default number of bumps is 100 (10 X 10). You need to change these 4 vS!99v)
parameters to match your design. Note that LightTools allows many other Q ^rW^d
placement options, but you will use the Bezier placement option for this E}=NZqOB!
example. #^ #i]{g
5.On both the X Placement tab and Y Placement tab, change the Number of )M 0O=Cl1
Bumps parameter to 300, as shown in the following figure. Click Apply after yFo5 pKF.J
each change. PEIr-qs%D
6.Click OK to close the dialog box. BaAb4{
Note that the number of bumps is 300 X 300, which results in about 90,000 bicL %I2h
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a xk8p,>/
manner defined by the Bezier parameterization option. Please see Chapter 5 of UD`Z;F
the LightTools Core Module User’s Guide for more information. With the &7&*As
current parameter values, the Bezier option varies the bump spacing along the z:5ROlk 0
length of the light guide. The spacing in the orthogonal direction is constant. u_8 22Z
The X and Y refer to the local coordinate system of the surface. oZ[ w
LightTools Introductory Tutorial * 91 SGd.z6"H
A#:
c
HAPTER 5 Introduction to Backlight Design *XO KH +_u
C -RQQ|:O$
Examining Surface Properties ,
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Using the methods described in previous chapters, you may want to check your 7F :;3c
model before you run a simulation.
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Click on various parts of the model in the 3D Design View. Or use the System q:EQ,
Navigator to select different surfaces and view their Properties. J9.p8A^^2
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 63Yu05'
click Zones, and then click Texture. %iC63)(M
2.Select SphericalElement, and then right-click and select Properties from the ueBoSZRWX
shortcut menu. The Shape tab shows you a graphical representation of the x{V>(d'p
spherical bump shape that is the bottom of the light guide. iQ C&d_#
You might be curious as to why you cannot see the 3D texture property zones you }{oBKm9_p
defined. They are invisible by default, because drawing thousands of texture L0 2 ~FT
elements can make displaying and exploring the model somewhat slow. If you 12xP)*:$
choose to make them visible, 3D textures are displayed in wireframe, even if the ]?$y}
display mode is set to translucent. Wireframe rendering displays a bit faster and -yGm^EwP
shows more of the technical details. {WOfT6y+
92 * LightTools Introductory Tutorial SkRQFm0a~
RpP[ymMZJ
HAPTER 5 Introduction to Backlight Design jdf)bO(9#
C $ _Bu,;
1.Rotate and zoom the model to that you can see something like the illustration &(^u19TKl
below: (kyo?3
. R mV/ wY
2.To reveal the Property Zones: d|+jCTKS
a.Right-click in the Design View and select View Preferences to display this 4 S9,
tc&
dialog box. TbAdTm W
b.On the Visibility tab, click the Property Zone check box to turn it on. A!Ct,%
c.Click OK. U2lC !j%K
You will see the wire frame rendering of the spherical bumps on the /~cL L
bottom surface, and a solid color above it. The solid color is the 3D texture b\m( 0/x
of the BEFs (brightness-enhancing films) built automatically by the utility.
