The default number of bumps is 100 (10 X 10). You need to change these 5g%D0_e5
parameters to match your design. Note that LightTools allows many other e Z]>;5
placement options, but you will use the Bezier placement option for this z }Lf]w?
example. m*wDJEKo
5.On both the X Placement tab and Y Placement tab, change the Number of KVevvy)W
Bumps parameter to 300, as shown in the following figure. Click Apply after Quwq_ .DU
each change. /PV x
6.Click OK to close the dialog box. Kv)Kn8df
Note that the number of bumps is 300 X 300, which results in about 90,000 :N ! s@6
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a TNDp{!<|L;
manner defined by the Bezier parameterization option. Please see Chapter 5 of Wf3{z
D~
the LightTools Core Module User’s Guide for more information. With the #qu;{I#W3
current parameter values, the Bezier option varies the bump spacing along the YSzC's[
length of the light guide. The spacing in the orthogonal direction is constant. Fh/ psd
The X and Y refer to the local coordinate system of the surface. |!81M| H
LightTools Introductory Tutorial * 91 Y <`X$
x~ i\*Ox^
HAPTER 5 Introduction to Backlight Design ]UkqPtG;
C n/Dg)n?
Examining Surface Properties Uw]o9 e0S
Using the methods described in previous chapters, you may want to check your O2":)zU.
model before you run a simulation. r $[{sW
Click on various parts of the model in the 3D Design View. Or use the System K8 /jfm
Navigator to select different surfaces and view their Properties. 'C=(?H )M
1.In the System Navigator, click to open BottomSurface of the LightGuide, then U'^ G-@
click Zones, and then click Texture. Rh!m1Q(-
2.Select SphericalElement, and then right-click and select Properties from the *0vRVlYf
shortcut menu. The Shape tab shows you a graphical representation of the 6"[J[7up
spherical bump shape that is the bottom of the light guide. i%GiWanG
You might be curious as to why you cannot see the 3D texture property zones you EL%P v1
defined. They are invisible by default, because drawing thousands of texture B}P!WRNmln
elements can make displaying and exploring the model somewhat slow. If you DJ0jtv6nQ-
choose to make them visible, 3D textures are displayed in wireframe, even if the iMv):1p>8
display mode is set to translucent. Wireframe rendering displays a bit faster and 7xM4=\~ OG
shows more of the technical details. TV|Z$,6l
92 * LightTools Introductory Tutorial #)m [R5g(
yRi5t{!V
HAPTER 5 Introduction to Backlight Design <I*N=;7
C V*r/0|vd
1.Rotate and zoom the model to that you can see something like the illustration *ZV3]ig2$
below: /l$ fQ:l
. ;s #I b_
2.To reveal the Property Zones: l*(L"]
a.Right-click in the Design View and select View Preferences to display this WL|71?@C
dialog box. fu{v(^
b.On the Visibility tab, click the Property Zone check box to turn it on. jd2 p~W
c.Click OK. belBdxa{"
You will see the wire frame rendering of the spherical bumps on the Q@|"xKa
bottom surface, and a solid color above it. The solid color is the 3D texture MskO Pg
of the BEFs (brightness-enhancing films) built automatically by the utility.
