The default number of bumps is 100 (10 X 10). You need to change these 1xTTJyoq
parameters to match your design. Note that LightTools allows many other l)8sw=
placement options, but you will use the Bezier placement option for this gaeOgP.0
example. r/AHJU3&eY
5.On both the X Placement tab and Y Placement tab, change the Number of (I=6N nt'
Bumps parameter to 300, as shown in the following figure. Click Apply after g42T#p8^
each change. _4R,Ej}
6.Click OK to close the dialog box. zilaP)5x6
Note that the number of bumps is 300 X 300, which results in about 90,000 (hf zM+2
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ~ hm`uP
manner defined by the Bezier parameterization option. Please see Chapter 5 of ?} sOG?{
the LightTools Core Module User’s Guide for more information. With the C EqZ:c
current parameter values, the Bezier option varies the bump spacing along the treXOC9^B8
length of the light guide. The spacing in the orthogonal direction is constant. <]Y[XI(kr
The X and Y refer to the local coordinate system of the surface. "{(
[!
LightTools Introductory Tutorial * 91 Bp3L>AcVu
kp`0erJqw
HAPTER 5 Introduction to Backlight Design 'F5)ACA %
C @ ER1zK K?
Examining Surface Properties Jz$ >k$!UD
Using the methods described in previous chapters, you may want to check your RWik J
model before you run a simulation. |s| /]aD}o
Click on various parts of the model in the 3D Design View. Or use the System K-4t dC3
Navigator to select different surfaces and view their Properties. v@_in(dk
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Mi 74Xl i
click Zones, and then click Texture. ,qy&|4Jz
2.Select SphericalElement, and then right-click and select Properties from the uaxB -PZ
shortcut menu. The Shape tab shows you a graphical representation of the ^saM$e^c:
spherical bump shape that is the bottom of the light guide. 'v`_Ii|-
You might be curious as to why you cannot see the 3D texture property zones you F^rl$#pCS
defined. They are invisible by default, because drawing thousands of texture ^<;w+% [MT
elements can make displaying and exploring the model somewhat slow. If you [TCRB`nTQF
choose to make them visible, 3D textures are displayed in wireframe, even if the EUZq$@uWL
display mode is set to translucent. Wireframe rendering displays a bit faster and -N z}DW>
shows more of the technical details. H[BYE
92 * LightTools Introductory Tutorial 0N VI +Z$
U**)H_S/~
HAPTER 5 Introduction to Backlight Design Z| L2oc e
C }vD;DSz:
1.Rotate and zoom the model to that you can see something like the illustration ;*QN9T= 0
below: !!+Da>
. C BlXC7_Mi
2.To reveal the Property Zones: .,mM%w,^O
a.Right-click in the Design View and select View Preferences to display this \7
Mq $ d
dialog box. g7Z9F[d
b.On the Visibility tab, click the Property Zone check box to turn it on. q?i Cc c
c.Click OK. oD,C<[(p
You will see the wire frame rendering of the spherical bumps on the >zR14VO`_|
bottom surface, and a solid color above it. The solid color is the 3D texture UE7'B?
of the BEFs (brightness-enhancing films) built automatically by the utility.
