The default number of bumps is 100 (10 X 10). You need to change these > C+0LF`U
parameters to match your design. Note that LightTools allows many other 0(|R N V_
placement options, but you will use the Bezier placement option for this Jme}{!3m
example. +cvz
5.On both the X Placement tab and Y Placement tab, change the Number of r /HKxXT
Bumps parameter to 300, as shown in the following figure. Click Apply after cE 8vSQ%
each change. [#V"a:8m}
6.Click OK to close the dialog box. J9)wt ?%j
Note that the number of bumps is 300 X 300, which results in about 90,000 &UP@Sr0D7
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a B3O^(M5W
manner defined by the Bezier parameterization option. Please see Chapter 5 of qnW 5I_]
the LightTools Core Module User’s Guide for more information. With the HB {-^9{E
current parameter values, the Bezier option varies the bump spacing along the [ P OcO
length of the light guide. The spacing in the orthogonal direction is constant. 6T< ~mn
The X and Y refer to the local coordinate system of the surface. |.=Ee+HZ
LightTools Introductory Tutorial * 91 -?e~dLu
>4ebvM
0|
HAPTER 5 Introduction to Backlight Design *0{MAm
C Z%Y=Lx
Examining Surface Properties >ly= O
Using the methods described in previous chapters, you may want to check your W 0tBF&E"
model before you run a simulation. %83PbH
Click on various parts of the model in the 3D Design View. Or use the System eM/|"^%
Navigator to select different surfaces and view their Properties. m(y?3} h
1.In the System Navigator, click to open BottomSurface of the LightGuide, then <E$P
click Zones, and then click Texture. q\O'r[&V
2.Select SphericalElement, and then right-click and select Properties from the f<xF+w E
shortcut menu. The Shape tab shows you a graphical representation of the j_&/^-; e
spherical bump shape that is the bottom of the light guide. cmt3ceCb
You might be curious as to why you cannot see the 3D texture property zones you C+P}R]cT"
defined. They are invisible by default, because drawing thousands of texture m{mK; D
elements can make displaying and exploring the model somewhat slow. If you 0vS%m/Zi-
choose to make them visible, 3D textures are displayed in wireframe, even if the 2c5>0f
display mode is set to translucent. Wireframe rendering displays a bit faster and 4I"Q T(;
shows more of the technical details. 174H@
92 * LightTools Introductory Tutorial S#jH2fRo
}n 6BI}n
HAPTER 5 Introduction to Backlight Design zVxiCyU
C x?:WR*5w
1.Rotate and zoom the model to that you can see something like the illustration o1Mb HBb
below: Br]VCp
. ~IE:i-K z
2.To reveal the Property Zones: o|] xj'
a.Right-click in the Design View and select View Preferences to display this aC]~
dialog box.
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b.On the Visibility tab, click the Property Zone check box to turn it on. s? ~Abj_
c.Click OK. !aa^kcEjnL
You will see the wire frame rendering of the spherical bumps on the RduA0@g0
bottom surface, and a solid color above it. The solid color is the 3D texture +SPC@E_v
of the BEFs (brightness-enhancing films) built automatically by the utility.
