The default number of bumps is 100 (10 X 10). You need to change these snTJe[^d
parameters to match your design. Note that LightTools allows many other AY/-j$5+?
placement options, but you will use the Bezier placement option for this *Nf4bH%MN
example. z)W#&JFF
5.On both the X Placement tab and Y Placement tab, change the Number of Sp`fh7d.(
Bumps parameter to 300, as shown in the following figure. Click Apply after kf^-m/
each change. i^ sDh>$J
6.Click OK to close the dialog box. i_9Cc$Qh<
Note that the number of bumps is 300 X 300, which results in about 90,000 z N)|g
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 7<QYT+6xV
manner defined by the Bezier parameterization option. Please see Chapter 5 of _]=TFz2O
the LightTools Core Module User’s Guide for more information. With the !|Xl 8lV`
current parameter values, the Bezier option varies the bump spacing along the <^*+8{*
length of the light guide. The spacing in the orthogonal direction is constant. )Vg{Y [!
The X and Y refer to the local coordinate system of the surface. ."F'5eTT~
LightTools Introductory Tutorial * 91 3vRL g b
N}}PlGp$
HAPTER 5 Introduction to Backlight Design K.#,O+-Kg`
C 0X R;5kd%
Examining Surface Properties &w;^m/zP3
Using the methods described in previous chapters, you may want to check your }/7.+yD
model before you run a simulation. !4 4mT'Y
Click on various parts of the model in the 3D Design View. Or use the System K.V!@bPlw9
Navigator to select different surfaces and view their Properties. s;-78ejj7
1.In the System Navigator, click to open BottomSurface of the LightGuide, then vh. Wm?qQ
click Zones, and then click Texture. ^T}}4I_Y
2.Select SphericalElement, and then right-click and select Properties from the O{") i;v @
shortcut menu. The Shape tab shows you a graphical representation of the 9 N*S-Po=
spherical bump shape that is the bottom of the light guide. k}I5x1>&
You might be curious as to why you cannot see the 3D texture property zones you wv7p,9Z [
defined. They are invisible by default, because drawing thousands of texture *3.yumcv{L
elements can make displaying and exploring the model somewhat slow. If you W>q* .9}Y"
choose to make them visible, 3D textures are displayed in wireframe, even if the e}](6"t`5
display mode is set to translucent. Wireframe rendering displays a bit faster and EDq$vB
shows more of the technical details. 0gv3v@QO
92 * LightTools Introductory Tutorial 9* -pden
l
J3lG"Ww
HAPTER 5 Introduction to Backlight Design r}_Lb.1]
C eN<>#: `
1.Rotate and zoom the model to that you can see something like the illustration 0.J1!RIK/
below: Xc8= 2n
. )tN?: l
2.To reveal the Property Zones: 'B:Z=0{>N
a.Right-click in the Design View and select View Preferences to display this y"|K
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dialog box. #uD)0zdw
b.On the Visibility tab, click the Property Zone check box to turn it on. G!!- +n<
c.Click OK. v2M"b?Q
You will see the wire frame rendering of the spherical bumps on the |n|U;|'^
bottom surface, and a solid color above it. The solid color is the 3D texture 3r~>~ueZ
of the BEFs (brightness-enhancing films) built automatically by the utility.
