The default number of bumps is 100 (10 X 10). You need to change these [p' A?-
parameters to match your design. Note that LightTools allows many other 6 .9C 4
placement options, but you will use the Bezier placement option for this ` ZZ3!$czR
example. fW Pa1E@
5.On both the X Placement tab and Y Placement tab, change the Number of q:nUn?zB
Bumps parameter to 300, as shown in the following figure. Click Apply after \!hd|j?&6
each change. )Z/$;7 ]#
6.Click OK to close the dialog box. !rs }83w!
Note that the number of bumps is 300 X 300, which results in about 90,000 ^rs{1S
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a
lI%RdA[
manner defined by the Bezier parameterization option. Please see Chapter 5 of E,F^!4 rJ$
the LightTools Core Module User’s Guide for more information. With the MQDLC7Y.p5
current parameter values, the Bezier option varies the bump spacing along the ,{\Ae"{6
length of the light guide. The spacing in the orthogonal direction is constant. fs yVu|G
The X and Y refer to the local coordinate system of the surface. 'gXD?ARW
LightTools Introductory Tutorial * 91 rg ; 4INs#
Z
t4q=
Lr
HAPTER 5 Introduction to Backlight Design ML lvs a0
C e$teh`
p3
Examining Surface Properties p0y|pD
Using the methods described in previous chapters, you may want to check your skXzck
model before you run a simulation. >Tjl?CS
Click on various parts of the model in the 3D Design View. Or use the System 1;KJUf[N
Navigator to select different surfaces and view their Properties. *|j4>W\J
1.In the System Navigator, click to open BottomSurface of the LightGuide, then g_n_Qlo
click Zones, and then click Texture. tK@7t0
2.Select SphericalElement, and then right-click and select Properties from the R>Dr1fc}
shortcut menu. The Shape tab shows you a graphical representation of the H)h^|A/vO
spherical bump shape that is the bottom of the light guide. BW6Ox=sr<
You might be curious as to why you cannot see the 3D texture property zones you ;&gk)w6*
defined. They are invisible by default, because drawing thousands of texture St(jrZb
elements can make displaying and exploring the model somewhat slow. If you p^}`^>OL
choose to make them visible, 3D textures are displayed in wireframe, even if the 3.Yg3&"Z
display mode is set to translucent. Wireframe rendering displays a bit faster and ZXL'R | ?
shows more of the technical details. {]U
\HE1w
92 * LightTools Introductory Tutorial ~ES%=if~Y
%I9f_5BlT8
HAPTER 5 Introduction to Backlight Design vNs` Uk A
C q.<)0nk
1.Rotate and zoom the model to that you can see something like the illustration x_I*6?
below: Sk"hqF.2
. ?&zi{N
2.To reveal the Property Zones: 3s| :7
a.Right-click in the Design View and select View Preferences to display this OiXO <1'$
dialog box. i-;#FT+ Xc
b.On the Visibility tab, click the Property Zone check box to turn it on. =- ~))!(
c.Click OK. Aqmw#X
You will see the wire frame rendering of the spherical bumps on the -9 .lF uI
bottom surface, and a solid color above it. The solid color is the 3D texture <"6\\#}VG
of the BEFs (brightness-enhancing films) built automatically by the utility.
