The default number of bumps is 100 (10 X 10). You need to change these :DZiDJ@
parameters to match your design. Note that LightTools allows many other 71 2i |
placement options, but you will use the Bezier placement option for this Tu"yoF
example. T&h|sa(
5.On both the X Placement tab and Y Placement tab, change the Number of FqiK}K.~/
Bumps parameter to 300, as shown in the following figure. Click Apply after B[*i}k%i
each change. RXP"v-
6.Click OK to close the dialog box. [IYs4Y5
Note that the number of bumps is 300 X 300, which results in about 90,000 !F% dE!
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a C/cyqxVl}
manner defined by the Bezier parameterization option. Please see Chapter 5 of d,>l;l
the LightTools Core Module User’s Guide for more information. With the E6 US
current parameter values, the Bezier option varies the bump spacing along the d
EXw=u
length of the light guide. The spacing in the orthogonal direction is constant. z C``G<TB
The X and Y refer to the local coordinate system of the surface. 1k7E[G~G|
LightTools Introductory Tutorial * 91 "47nc1T+n
z6Hl+nq B
HAPTER 5 Introduction to Backlight Design /RMep8 &
C ]l\J"*"aB
Examining Surface Properties ;m\(fW*ii
Using the methods described in previous chapters, you may want to check your 8 Ej2JMc
model before you run a simulation. Q'rG' |
Click on various parts of the model in the 3D Design View. Or use the System rN*4Y
Navigator to select different surfaces and view their Properties. C R _A{(
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ,JjTz O
click Zones, and then click Texture. L h0<A%
2.Select SphericalElement, and then right-click and select Properties from the
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shortcut menu. The Shape tab shows you a graphical representation of the sPhh#VCw{
spherical bump shape that is the bottom of the light guide. $DQMN
You might be curious as to why you cannot see the 3D texture property zones you % @IR7v~
defined. They are invisible by default, because drawing thousands of texture 4[(P>`Unx
elements can make displaying and exploring the model somewhat slow. If you E 0* 81PS
choose to make them visible, 3D textures are displayed in wireframe, even if the ?>w%Lg{L}
display mode is set to translucent. Wireframe rendering displays a bit faster and "{&!fD~w
shows more of the technical details. J4JKAv~3
92 * LightTools Introductory Tutorial U_!6pqFc
=A,i9Z&
HAPTER 5 Introduction to Backlight Design >Rr]e`3wG
C NQOdgp
1.Rotate and zoom the model to that you can see something like the illustration ]v+\v re
below: :${Lm&J
. , n+dB2\
2.To reveal the Property Zones: EJRwyF5 LK
a.Right-click in the Design View and select View Preferences to display this Va{`es)hky
dialog box. 3n,F5?! m
b.On the Visibility tab, click the Property Zone check box to turn it on. h-6kf:XP%
c.Click OK. H_jMl$f)j
You will see the wire frame rendering of the spherical bumps on the H*!E*_
bottom surface, and a solid color above it. The solid color is the 3D texture -ERDW Y
of the BEFs (brightness-enhancing films) built automatically by the utility.
