The default number of bumps is 100 (10 X 10). You need to change these jC>ZMy8U)4
parameters to match your design. Note that LightTools allows many other 'D5J5+.z
placement options, but you will use the Bezier placement option for this St%x \[D
example. X|hY ZR
5.On both the X Placement tab and Y Placement tab, change the Number of ru eaP
Bumps parameter to 300, as shown in the following figure. Click Apply after )Ac,F6w
each change. iiq
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6.Click OK to close the dialog box. :V+rC]0
Note that the number of bumps is 300 X 300, which results in about 90,000 ~3:hed7:
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a u$%C`v>
manner defined by the Bezier parameterization option. Please see Chapter 5 of ,ZJ}X 9$<
the LightTools Core Module User’s Guide for more information. With the EZB0qZIp
current parameter values, the Bezier option varies the bump spacing along the F-|DZ?)k5
length of the light guide. The spacing in the orthogonal direction is constant. U%:%. Bys
The X and Y refer to the local coordinate system of the surface. }NC$C e
LightTools Introductory Tutorial * 91 2T2<I/")O
1sj7]G]`k
HAPTER 5 Introduction to Backlight Design @9 S ::
C ^R@)C IQ
Examining Surface Properties 2PS ExK57
Using the methods described in previous chapters, you may want to check your GCN-T1HvA2
model before you run a simulation. fL 2P6N@
Click on various parts of the model in the 3D Design View. Or use the System YM_ [
Navigator to select different surfaces and view their Properties. cwzkA,e@
1.In the System Navigator, click to open BottomSurface of the LightGuide, then _1gN U]"
click Zones, and then click Texture. o!UB x<4
2.Select SphericalElement, and then right-click and select Properties from the \ 2y/:
shortcut menu. The Shape tab shows you a graphical representation of the geyCS3
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spherical bump shape that is the bottom of the light guide. IwnDG;+Ap
You might be curious as to why you cannot see the 3D texture property zones you #VX]trh,
defined. They are invisible by default, because drawing thousands of texture fs#9~b3
elements can make displaying and exploring the model somewhat slow. If you H I|a88
choose to make them visible, 3D textures are displayed in wireframe, even if the qWr=Oiu
display mode is set to translucent. Wireframe rendering displays a bit faster and qLL rR,:
shows more of the technical details. im &N &A
92 * LightTools Introductory Tutorial md{nHX&
ZXQ5fBx
HAPTER 5 Introduction to Backlight Design 3 '.3RKV
C rogy`mh\r2
1.Rotate and zoom the model to that you can see something like the illustration Lf%3-P
below: @ ~hy'6/
. Lld45Bayb
2.To reveal the Property Zones: RM_% u=jC
a.Right-click in the Design View and select View Preferences to display this Xf&YcHo
dialog box. g$GGo[_0
b.On the Visibility tab, click the Property Zone check box to turn it on. 2Ty ]s~
c.Click OK. ]}/Rl}_
You will see the wire frame rendering of the spherical bumps on the 'hr_g* i
bottom surface, and a solid color above it. The solid color is the 3D texture u|IS7>Sm
of the BEFs (brightness-enhancing films) built automatically by the utility.
