The default number of bumps is 100 (10 X 10). You need to change these ec Dni>W
parameters to match your design. Note that LightTools allows many other 8 [\F*H
placement options, but you will use the Bezier placement option for this @E;'Ffo
example. @iwVU]j
5.On both the X Placement tab and Y Placement tab, change the Number of <E/4/
ANN
Bumps parameter to 300, as shown in the following figure. Click Apply after K4~z@.
G6*
each change. iZ}Afj
6.Click OK to close the dialog box. I
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Note that the number of bumps is 300 X 300, which results in about 90,000 G_vWwH4XtL
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a bnHQvCO3$
manner defined by the Bezier parameterization option. Please see Chapter 5 of q M=
$, s*
the LightTools Core Module User’s Guide for more information. With the h\| ~Q.kG
current parameter values, the Bezier option varies the bump spacing along the }N[|2n R'
length of the light guide. The spacing in the orthogonal direction is constant. tj$&89
The X and Y refer to the local coordinate system of the surface. & mwQj<Z
LightTools Introductory Tutorial * 91 v;m`d{(i2
_/(DEF+G
HAPTER 5 Introduction to Backlight Design n wuH:6~"
C +yYxHIOZ(
Examining Surface Properties H @ Yj
Using the methods described in previous chapters, you may want to check your vP6NIcWC3
model before you run a simulation. f y9mS
Click on various parts of the model in the 3D Design View. Or use the System 7[z^0?Pygf
Navigator to select different surfaces and view their Properties. 0<tce
1.In the System Navigator, click to open BottomSurface of the LightGuide, then eaj ctkzj
click Zones, and then click Texture. k{\wjaf)
2.Select SphericalElement, and then right-click and select Properties from the (=&z:-52V
shortcut menu. The Shape tab shows you a graphical representation of the qLC_p)
spherical bump shape that is the bottom of the light guide. %87D(h!.I4
You might be curious as to why you cannot see the 3D texture property zones you mV!Ia -k
defined. They are invisible by default, because drawing thousands of texture LX f r
elements can make displaying and exploring the model somewhat slow. If you }_Y&kaM
choose to make them visible, 3D textures are displayed in wireframe, even if the TQ`s&8"P
display mode is set to translucent. Wireframe rendering displays a bit faster and <14,xYpE
shows more of the technical details. ?R-4uG[(
92 * LightTools Introductory Tutorial ~-2%^ovB
D)shWJRlvW
HAPTER 5 Introduction to Backlight Design (<GBh Nj=c
C c{.y9P6
1.Rotate and zoom the model to that you can see something like the illustration 1. A@5* Q
below: rtM29~c> @
. 9;2{=,
2.To reveal the Property Zones: . -ihxEbzr
a.Right-click in the Design View and select View Preferences to display this M2Q*#U>6r
dialog box. CE,0@%6F*
b.On the Visibility tab, click the Property Zone check box to turn it on. `U4e]Qh/+
c.Click OK. A-"2 sp*t
You will see the wire frame rendering of the spherical bumps on the - Cn x!g}
bottom surface, and a solid color above it. The solid color is the 3D texture C2e.RTxc
of the BEFs (brightness-enhancing films) built automatically by the utility.
