The default number of bumps is 100 (10 X 10). You need to change these MEE]6nU
parameters to match your design. Note that LightTools allows many other \|k U{d0
placement options, but you will use the Bezier placement option for this SRMy#j-
example. / wEr>[8S
5.On both the X Placement tab and Y Placement tab, change the Number of - 7CkOZT
Bumps parameter to 300, as shown in the following figure. Click Apply after &A>J> b
each change. r~X6qC
6.Click OK to close the dialog box. 4&tY5m >
Note that the number of bumps is 300 X 300, which results in about 90,000 ~{J.br`
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a r(RJ& \ !
manner defined by the Bezier parameterization option. Please see Chapter 5 of
) s M}BY
the LightTools Core Module User’s Guide for more information. With the umc!KOkL
current parameter values, the Bezier option varies the bump spacing along the *%8d W
length of the light guide. The spacing in the orthogonal direction is constant. 0@2%pIq\
The X and Y refer to the local coordinate system of the surface. Q-AN~k8+)[
LightTools Introductory Tutorial * 91 U`D"L4},.
w1.~N`g$
HAPTER 5 Introduction to Backlight Design zk?lN s
C
!9-dS =:Y
Examining Surface Properties o9JJ_-O"
Using the methods described in previous chapters, you may want to check your "p<f#s}
model before you run a simulation. 3N?uY2
Click on various parts of the model in the 3D Design View. Or use the System C0e<
_6p=
Navigator to select different surfaces and view their Properties. ],#9L
1.In the System Navigator, click to open BottomSurface of the LightGuide, then p0b&CrALx
click Zones, and then click Texture. FG? B:Zl%T
2.Select SphericalElement, and then right-click and select Properties from the a XwFQ,
shortcut menu. The Shape tab shows you a graphical representation of the h)sc-e
spherical bump shape that is the bottom of the light guide. rLp0VKPe
You might be curious as to why you cannot see the 3D texture property zones you ezFyd 'P
defined. They are invisible by default, because drawing thousands of texture ]^dX B 0
elements can make displaying and exploring the model somewhat slow. If you R5Ti|k.~Y"
choose to make them visible, 3D textures are displayed in wireframe, even if the 6x_8m^+m
display mode is set to translucent. Wireframe rendering displays a bit faster and q0Fy$e]u
shows more of the technical details. WFTTBUoH
92 * LightTools Introductory Tutorial W Qe>1
qz ?9:"~$C
HAPTER 5 Introduction to Backlight Design =5+:<e,&
C (ue;O~
1.Rotate and zoom the model to that you can see something like the illustration L,n'G%
below: S-My 6'ar
. 7&2xUcsz)
2.To reveal the Property Zones: (g5T2(_6L
a.Right-click in the Design View and select View Preferences to display this ;vuok] @
dialog box. ~Xa >;
b.On the Visibility tab, click the Property Zone check box to turn it on. 23 3jT@Z
c.Click OK. (T,ST3{*k
You will see the wire frame rendering of the spherical bumps on the fy7]I?vm@
bottom surface, and a solid color above it. The solid color is the 3D texture ~u.CY
of the BEFs (brightness-enhancing films) built automatically by the utility.
