The default number of bumps is 100 (10 X 10). You need to change these TAB'oLNp
parameters to match your design. Note that LightTools allows many other !{q_ Q !
placement options, but you will use the Bezier placement option for this m )Ta5w^
example. f*o+g:]3
5.On both the X Placement tab and Y Placement tab, change the Number of \?t E,\Ln
Bumps parameter to 300, as shown in the following figure. Click Apply after i+90##4<?
each change. + 9ex ap27
6.Click OK to close the dialog box. WYJH+"@%j
Note that the number of bumps is 300 X 300, which results in about 90,000 )s N}ClgJ
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a q{Ao
j
manner defined by the Bezier parameterization option. Please see Chapter 5 of 9$ f%
the LightTools Core Module User’s Guide for more information. With the ij5|P4Eka
current parameter values, the Bezier option varies the bump spacing along the 4ibOVBG:*,
length of the light guide. The spacing in the orthogonal direction is constant. fDjJ dRS"
The X and Y refer to the local coordinate system of the surface. C&HN#Q_
LightTools Introductory Tutorial * 91 F/
o }5H
3!M|Sf<s
HAPTER 5 Introduction to Backlight Design I9Lt> *
C `l2 h65\
Examining Surface Properties MFeY}_d<
Using the methods described in previous chapters, you may want to check your otA'+4\
model before you run a simulation. |_ njN
Click on various parts of the model in the 3D Design View. Or use the System (}m 2}
Navigator to select different surfaces and view their Properties.
XFSHl[uS1
1.In the System Navigator, click to open BottomSurface of the LightGuide, then % 0Ibi
click Zones, and then click Texture. # Rhtaq9
2.Select SphericalElement, and then right-click and select Properties from the K2{6{X=
shortcut menu. The Shape tab shows you a graphical representation of the ~^bf1W[
spherical bump shape that is the bottom of the light guide. fG zx;<0P!
You might be curious as to why you cannot see the 3D texture property zones you ka/>jV"
defined. They are invisible by default, because drawing thousands of texture xc}kDpF=g
elements can make displaying and exploring the model somewhat slow. If you #f@}$@
choose to make them visible, 3D textures are displayed in wireframe, even if the \NTVg6>qN
display mode is set to translucent. Wireframe rendering displays a bit faster and j-#h^3l1?
shows more of the technical details. .cm9&&"Z
92 * LightTools Introductory Tutorial f cnv[B..{
%6\L^RP
HAPTER 5 Introduction to Backlight Design 6<fcG
C :.= #U
1.Rotate and zoom the model to that you can see something like the illustration %mAwK<MY`
below: k%R(Qga
. ?f= ~Pn+
2.To reveal the Property Zones: _MW W
a.Right-click in the Design View and select View Preferences to display this 3 S .2
dialog box. :28[k~.bo
b.On the Visibility tab, click the Property Zone check box to turn it on. Lb#PiTJI
c.Click OK. .Zc:$"gDu
You will see the wire frame rendering of the spherical bumps on the G/ H>M%M
bottom surface, and a solid color above it. The solid color is the 3D texture y[ZVi5) ,
of the BEFs (brightness-enhancing films) built automatically by the utility.
