The default number of bumps is 100 (10 X 10). You need to change these %K\?E98M
parameters to match your design. Note that LightTools allows many other \<y`!"c
placement options, but you will use the Bezier placement option for this kD*2~Z ?;
example. an|x$e7|?
5.On both the X Placement tab and Y Placement tab, change the Number of zY,r9<I8_x
Bumps parameter to 300, as shown in the following figure. Click Apply after _C(m<n
each change. #tZ4N7
6.Click OK to close the dialog box. !OA]s%u
Note that the number of bumps is 300 X 300, which results in about 90,000 V#cqRE3XNi
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ^;/b+ /B0
manner defined by the Bezier parameterization option. Please see Chapter 5 of JS*m65e
the LightTools Core Module User’s Guide for more information. With the bKrhIU[
current parameter values, the Bezier option varies the bump spacing along the 3jlh}t> $l
length of the light guide. The spacing in the orthogonal direction is constant. qjf[zF
The X and Y refer to the local coordinate system of the surface. eU<]o<
\Qo
LightTools Introductory Tutorial * 91 s}jHl8
H2um|6>
HAPTER 5 Introduction to Backlight Design ag*mG*Z
C LM7$}#$R
Examining Surface Properties ^j" .
Using the methods described in previous chapters, you may want to check your J(c{y]` J
model before you run a simulation. @1DX
Click on various parts of the model in the 3D Design View. Or use the System r :F
Navigator to select different surfaces and view their Properties. _Y8hb!#(
1.In the System Navigator, click to open BottomSurface of the LightGuide, then
e'0{?B
click Zones, and then click Texture. e XfZ5(na
2.Select SphericalElement, and then right-click and select Properties from the *d"DA[(
shortcut menu. The Shape tab shows you a graphical representation of the ve%
xxn:
spherical bump shape that is the bottom of the light guide. *M$0J'-BQ
You might be curious as to why you cannot see the 3D texture property zones you Bx/L<J@
defined. They are invisible by default, because drawing thousands of texture _i o+YzS
elements can make displaying and exploring the model somewhat slow. If you : {IO=^D=$
choose to make them visible, 3D textures are displayed in wireframe, even if the 1jc,
Y.mP
display mode is set to translucent. Wireframe rendering displays a bit faster and du)~kU>l
shows more of the technical details. Dh5X/y
92 * LightTools Introductory Tutorial $OP7l>KZY
DdVF,
HAPTER 5 Introduction to Backlight Design /c2w/+ _
C 0&/b4 2W
1.Rotate and zoom the model to that you can see something like the illustration Iz
;G*W18
below: mml<9fbH
. tQ H+)*
2.To reveal the Property Zones: ^4,a 8`
a.Right-click in the Design View and select View Preferences to display this (cN}Epi(D
dialog box. iVG-_RsKK
b.On the Visibility tab, click the Property Zone check box to turn it on. hi0R. V&
c.Click OK. _>9.v%5cs(
You will see the wire frame rendering of the spherical bumps on the | fSe>uVZ
bottom surface, and a solid color above it. The solid color is the 3D texture L2, 1Kt7
of the BEFs (brightness-enhancing films) built automatically by the utility.
