The default number of bumps is 100 (10 X 10). You need to change these TnA-;Ha
parameters to match your design. Note that LightTools allows many other 2r4Uh1D~
placement options, but you will use the Bezier placement option for this }W8;= $jr
example. nYSiS}?S .
5.On both the X Placement tab and Y Placement tab, change the Number of cn3\kT*
Bumps parameter to 300, as shown in the following figure. Click Apply after 3m)0z{n
each change. gp?uHKsM
6.Click OK to close the dialog box. 6OIte -c
Note that the number of bumps is 300 X 300, which results in about 90,000 EU;9 *W<
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Fb>?1i`RN
manner defined by the Bezier parameterization option. Please see Chapter 5 of $G+@_'
the LightTools Core Module User’s Guide for more information. With the vF+7V*<
current parameter values, the Bezier option varies the bump spacing along the ]Sz:|%JP1
length of the light guide. The spacing in the orthogonal direction is constant. )[IC?U:5I
The X and Y refer to the local coordinate system of the surface. RJ&RTo
LightTools Introductory Tutorial * 91 MUc$ j&
7"x;~X
HAPTER 5 Introduction to Backlight Design MK~ 8}x 2K
C g2ixx+`?|:
Examining Surface Properties KqJs ?Won
Using the methods described in previous chapters, you may want to check your KC6.Fr{
model before you run a simulation. L}b.ulkMD
Click on various parts of the model in the 3D Design View. Or use the System 5m 4P\y^a
Navigator to select different surfaces and view their Properties. {duz\k2
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 3M7/?TMw{6
click Zones, and then click Texture. i$#;Kpb`^
2.Select SphericalElement, and then right-click and select Properties from the Uz8ff
shortcut menu. The Shape tab shows you a graphical representation of the 783,s_
spherical bump shape that is the bottom of the light guide. 8MtGlW%Eh
You might be curious as to why you cannot see the 3D texture property zones you -f^tE, -
defined. They are invisible by default, because drawing thousands of texture q~o<*W
elements can make displaying and exploring the model somewhat slow. If you $( kF#
choose to make them visible, 3D textures are displayed in wireframe, even if the /Iokf@5
display mode is set to translucent. Wireframe rendering displays a bit faster and P |E| $)m
shows more of the technical details. "Gzz4D
92 * LightTools Introductory Tutorial v{N`.~,^
*OsQ}onv
HAPTER 5 Introduction to Backlight Design %) 1 ?TU
C G~[x
3L'
1.Rotate and zoom the model to that you can see something like the illustration 3(N$nsi
below: P3=G1=47U
. B m<`n;m
2.To reveal the Property Zones: \?-<4B c@
a.Right-click in the Design View and select View Preferences to display this V)k4:H
dialog box. o5PO =AN
b.On the Visibility tab, click the Property Zone check box to turn it on. .2t4tb(SUw
c.Click OK. 8kIksy
You will see the wire frame rendering of the spherical bumps on the ? :%@vM
bottom surface, and a solid color above it. The solid color is the 3D texture *:7rdzn
of the BEFs (brightness-enhancing films) built automatically by the utility.
