The default number of bumps is 100 (10 X 10). You need to change these nH[+n `{o
parameters to match your design. Note that LightTools allows many other ]axh*J3`i
placement options, but you will use the Bezier placement option for this RBGX_v?
example. ZafboqsDL
5.On both the X Placement tab and Y Placement tab, change the Number of I+;-p ]~
Bumps parameter to 300, as shown in the following figure. Click Apply after ra6o>lI(,
each change. K : LL_,
6.Click OK to close the dialog box. ~;#MpG;e
Note that the number of bumps is 300 X 300, which results in about 90,000 Is.WZY a
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a P?ep]
manner defined by the Bezier parameterization option. Please see Chapter 5 of =A!S/;z>
the LightTools Core Module User’s Guide for more information. With the z/]q)`G
current parameter values, the Bezier option varies the bump spacing along the pa<q ZZ
length of the light guide. The spacing in the orthogonal direction is constant. O'DW5hBL0
The X and Y refer to the local coordinate system of the surface. #exss=as/
LightTools Introductory Tutorial * 91 H+ C6[W=
7^: 4A'
HAPTER 5 Introduction to Backlight Design `a]44es9q
C xUWr}j4;
Examining Surface Properties BavO\{J#|0
Using the methods described in previous chapters, you may want to check your \nvAa_,
model before you run a simulation. O #kq^C}
Click on various parts of the model in the 3D Design View. Or use the System v"Jgw;3
Navigator to select different surfaces and view their Properties. 0GXO&rCG
1.In the System Navigator, click to open BottomSurface of the LightGuide, then /^7iZ|>:M:
click Zones, and then click Texture. qE7R4>5xjO
2.Select SphericalElement, and then right-click and select Properties from the q/ &y*)&'O
shortcut menu. The Shape tab shows you a graphical representation of the % _M2N.n
spherical bump shape that is the bottom of the light guide. \5><3*\
You might be curious as to why you cannot see the 3D texture property zones you ANM g
defined. They are invisible by default, because drawing thousands of texture k#JQxLy#
elements can make displaying and exploring the model somewhat slow. If you 0Z I(/r
choose to make them visible, 3D textures are displayed in wireframe, even if the saZ>?Owz
display mode is set to translucent. Wireframe rendering displays a bit faster and nCxAQ|P?
shows more of the technical details. ;N=G=X|}
92 * LightTools Introductory Tutorial ,L YFEq_
HgRwi It
HAPTER 5 Introduction to Backlight Design cma*Dc
C !u;>Wyd W
1.Rotate and zoom the model to that you can see something like the illustration kCP$I732
below: W{" XJt_
. bE\, }DTy
2.To reveal the Property Zones: b"j|Bb
a.Right-click in the Design View and select View Preferences to display this <:;^'x>!
dialog box. )R)a@op
b.On the Visibility tab, click the Property Zone check box to turn it on. kODK@w V-
c.Click OK. g /+oZU
You will see the wire frame rendering of the spherical bumps on the ;?L\Fz(<
bottom surface, and a solid color above it. The solid color is the 3D texture h
y-cG% f
of the BEFs (brightness-enhancing films) built automatically by the utility.
