The default number of bumps is 100 (10 X 10). You need to change these v{ <[)cr
parameters to match your design. Note that LightTools allows many other ~xIj F1Z
placement options, but you will use the Bezier placement option for this WX4;l(P L=
example. ( 7DXRcr<
5.On both the X Placement tab and Y Placement tab, change the Number of "Y=+Ls(3o(
Bumps parameter to 300, as shown in the following figure. Click Apply after DS xUdEK6
each change. pDh se2
6.Click OK to close the dialog box. mw^7oO#
Note that the number of bumps is 300 X 300, which results in about 90,000 J # kl
7
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a dXn%lJ
manner defined by the Bezier parameterization option. Please see Chapter 5 of *x>3xQq&
the LightTools Core Module User’s Guide for more information. With the 9,]5v +
current parameter values, the Bezier option varies the bump spacing along the *{o UWt
length of the light guide. The spacing in the orthogonal direction is constant. A%\tiZe
The X and Y refer to the local coordinate system of the surface. C_ LvZ=
LightTools Introductory Tutorial * 91 q:8_]Qt
ir3VTqz
HAPTER 5 Introduction to Backlight Design 0q FH
s
C OU7 %V)X5
Examining Surface Properties @ uH#qg7
Using the methods described in previous chapters, you may want to check your iK_ c.b
model before you run a simulation. kVS?RHR
Click on various parts of the model in the 3D Design View. Or use the System AD('=g J
Navigator to select different surfaces and view their Properties. i.1U|Pi
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 2yo
cu!4l
click Zones, and then click Texture. P6U%=xaC
2.Select SphericalElement, and then right-click and select Properties from the zX 7q:Pt
shortcut menu. The Shape tab shows you a graphical representation of the r(2 R <A
spherical bump shape that is the bottom of the light guide. PKq-@F%X
You might be curious as to why you cannot see the 3D texture property zones you 8n? kZY$,
defined. They are invisible by default, because drawing thousands of texture (!?K7<Jv
elements can make displaying and exploring the model somewhat slow. If you f0Hq8qAF;^
choose to make them visible, 3D textures are displayed in wireframe, even if the pz doqAVI
display mode is set to translucent. Wireframe rendering displays a bit faster and F: 37MUQi
shows more of the technical details. l!IKUzt )7
92 * LightTools Introductory Tutorial b*,3<
9
>E"9*:.^a
HAPTER 5 Introduction to Backlight Design /owO@~G
C #%S0PL"x U
1.Rotate and zoom the model to that you can see something like the illustration '=cKU0
G #
below: mgkyC5)d
. [B6DC `M
2.To reveal the Property Zones: Ygkv7>? ,
a.Right-click in the Design View and select View Preferences to display this PCfo
dialog box. Nw](".
b.On the Visibility tab, click the Property Zone check box to turn it on. N?23 m`3
c.Click OK. PJ 9%/Nrh
You will see the wire frame rendering of the spherical bumps on the {0's~U+@
bottom surface, and a solid color above it. The solid color is the 3D texture ^b53}f8H
of the BEFs (brightness-enhancing films) built automatically by the utility.
