The default number of bumps is 100 (10 X 10). You need to change these AS;{{^mM(
parameters to match your design. Note that LightTools allows many other oY: " nE
placement options, but you will use the Bezier placement option for this |@nXl ZE
example. j!/(9 *\
5.On both the X Placement tab and Y Placement tab, change the Number of TvR 2lP
Bumps parameter to 300, as shown in the following figure. Click Apply after
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each change. (;3jmdJhK
6.Click OK to close the dialog box. $? YkgK
Note that the number of bumps is 300 X 300, which results in about 90,000 /uVB[Tk^
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a A{vG@Pwc:
manner defined by the Bezier parameterization option. Please see Chapter 5 of z? ^p(UH
the LightTools Core Module User’s Guide for more information. With the &r_B\j3
current parameter values, the Bezier option varies the bump spacing along the =& 'j;j
length of the light guide. The spacing in the orthogonal direction is constant. t z{]H9
The X and Y refer to the local coordinate system of the surface. ?{V [bm
LightTools Introductory Tutorial * 91 F=H=[pSe
s_N!6$tS
HAPTER 5 Introduction to Backlight Design O%I'
C ZmDr$iU ~
Examining Surface Properties 5P4 >xv[
Using the methods described in previous chapters, you may want to check your sAxn
;
`
model before you run a simulation. V SxLBwXf
Click on various parts of the model in the 3D Design View. Or use the System +}n]A^&I\E
Navigator to select different surfaces and view their Properties. {+MMqJCa
1.In the System Navigator, click to open BottomSurface of the LightGuide, then :?T V6M
click Zones, and then click Texture. ~zx-'sc?
2.Select SphericalElement, and then right-click and select Properties from the C-7.Sa
shortcut menu. The Shape tab shows you a graphical representation of the M;OYh
spherical bump shape that is the bottom of the light guide. C~B^sG@;
You might be curious as to why you cannot see the 3D texture property zones you q$K~BgFzpZ
defined. They are invisible by default, because drawing thousands of texture 0M"E6 z)9
elements can make displaying and exploring the model somewhat slow. If you H >B:jJf
choose to make them visible, 3D textures are displayed in wireframe, even if the x]:mc%4-Z
display mode is set to translucent. Wireframe rendering displays a bit faster and x ;I*Ho
shows more of the technical details. UkUdpZ.[il
92 * LightTools Introductory Tutorial k"6^gup(U
7@`(DU `z
HAPTER 5 Introduction to Backlight Design wR KGJ
C CH2o[&
1.Rotate and zoom the model to that you can see something like the illustration {`: !=
below: sbV eB%k
. #q-t!C%E
2.To reveal the Property Zones: ~b +> o
a.Right-click in the Design View and select View Preferences to display this 4 ClW*l
dialog box. Y#G '[N>
b.On the Visibility tab, click the Property Zone check box to turn it on. 5Z Pl`[He
c.Click OK. 3^Ex_jeB
You will see the wire frame rendering of the spherical bumps on the #Rs7Ieu+
bottom surface, and a solid color above it. The solid color is the 3D texture n V<YwqK
of the BEFs (brightness-enhancing films) built automatically by the utility.
