The default number of bumps is 100 (10 X 10). You need to change these +eSNwR=
parameters to match your design. Note that LightTools allows many other R57>z`;
placement options, but you will use the Bezier placement option for this XKD0n^L[
example. 7\>P@s
5.On both the X Placement tab and Y Placement tab, change the Number of U5N/'p%)<
Bumps parameter to 300, as shown in the following figure. Click Apply after (jbHV.]P9
each change. u;f${Wn'3
6.Click OK to close the dialog box. e P]L
Note that the number of bumps is 300 X 300, which results in about 90,000 ru#,pJ=O(
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a # 9-qF9M
manner defined by the Bezier parameterization option. Please see Chapter 5 of HriY-=ji>a
the LightTools Core Module User’s Guide for more information. With the ~NT2QY5!K
current parameter values, the Bezier option varies the bump spacing along the 5VD(fW[OW]
length of the light guide. The spacing in the orthogonal direction is constant. iV#sMJN9
The X and Y refer to the local coordinate system of the surface. f]Jn\7j 4
LightTools Introductory Tutorial * 91 \ng!qN
nBw4YDR!
HAPTER 5 Introduction to Backlight Design _L } k.
C Dv~W!T i
Examining Surface Properties [B<htD&
Using the methods described in previous chapters, you may want to check your -D*,*L
model before you run a simulation. g\_J
Click on various parts of the model in the 3D Design View. Or use the System Wz D=Ol
Navigator to select different surfaces and view their Properties. nn[OC=cDN
1.In the System Navigator, click to open BottomSurface of the LightGuide, then i\~@2
click Zones, and then click Texture. >&pB&'A a
2.Select SphericalElement, and then right-click and select Properties from the &QHZ]2%U
shortcut menu. The Shape tab shows you a graphical representation of the $gZC"~BR
spherical bump shape that is the bottom of the light guide. AA=zDB<N
You might be curious as to why you cannot see the 3D texture property zones you jSi\ /( E
defined. They are invisible by default, because drawing thousands of texture Rq`B'G9|c
elements can make displaying and exploring the model somewhat slow. If you mhh^kwW
choose to make them visible, 3D textures are displayed in wireframe, even if the {}gx;v)
display mode is set to translucent. Wireframe rendering displays a bit faster and % gBulvg
shows more of the technical details. 2F5*C
92 * LightTools Introductory Tutorial lICpfcc(+
EWz,K] _ '
HAPTER 5 Introduction to Backlight Design fcaUj9qN
C okwkMd-yW
1.Rotate and zoom the model to that you can see something like the illustration {`RCh]W
below: KHnq%#
. t`F<lOKj
2.To reveal the Property Zones: 0iS"V^aH
a.Right-click in the Design View and select View Preferences to display this CuT~
Bj
dialog box. 'Cr2 &
dy
b.On the Visibility tab, click the Property Zone check box to turn it on. M3m)ui z
c.Click OK. h"#[{ $(
You will see the wire frame rendering of the spherical bumps on the {X r|L
bottom surface, and a solid color above it. The solid color is the 3D texture
Dk ^,iY(u
of the BEFs (brightness-enhancing films) built automatically by the utility.
