The default number of bumps is 100 (10 X 10). You need to change these ]~f-8!$$R
parameters to match your design. Note that LightTools allows many other /l3Oi@\
placement options, but you will use the Bezier placement option for this tI#65ox#
example. f4N N?"W)
5.On both the X Placement tab and Y Placement tab, change the Number of D; +Y0B
Bumps parameter to 300, as shown in the following figure. Click Apply after ncOl}\Q9
each change. yT7{,Z7t
6.Click OK to close the dialog box. \ :q @I]2
Note that the number of bumps is 300 X 300, which results in about 90,000 t
U~q4$qqE
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a &G\C [L
manner defined by the Bezier parameterization option. Please see Chapter 5 of -HuIz6
the LightTools Core Module User’s Guide for more information. With the _,UYbD\[J}
current parameter values, the Bezier option varies the bump spacing along the %]tW2s"
length of the light guide. The spacing in the orthogonal direction is constant. n-qle5s j
The X and Y refer to the local coordinate system of the surface. cd=H4:<T5
LightTools Introductory Tutorial * 91 V2@( BliP
!O'p{dj][
HAPTER 5 Introduction to Backlight Design ';D>Z ?l
C aYHs 35
Examining Surface Properties ^"vmIC.h
Using the methods described in previous chapters, you may want to check your :fy,%su
model before you run a simulation. VAyAXN~
Click on various parts of the model in the 3D Design View. Or use the System N}{V*H^0QU
Navigator to select different surfaces and view their Properties. O<Ay`p5
1.In the System Navigator, click to open BottomSurface of the LightGuide, then `Jj b4]
click Zones, and then click Texture. wnLpf
2.Select SphericalElement, and then right-click and select Properties from the s+G( N $0U
shortcut menu. The Shape tab shows you a graphical representation of the ^% g 8OP
spherical bump shape that is the bottom of the light guide. ybv< 1
You might be curious as to why you cannot see the 3D texture property zones you +#(GU9_i+M
defined. They are invisible by default, because drawing thousands of texture ^U,C])n
elements can make displaying and exploring the model somewhat slow. If you <+b~E,
choose to make them visible, 3D textures are displayed in wireframe, even if the _ |HA\!
display mode is set to translucent. Wireframe rendering displays a bit faster and M;KeY[u
shows more of the technical details. GU Mf}y
92 * LightTools Introductory Tutorial p#r qe<Ua
'9<8<d7?
HAPTER 5 Introduction to Backlight Design ]<q!pE;t
C 4ISIg \:c*
1.Rotate and zoom the model to that you can see something like the illustration j0 Os]a
below: JlEfUg#*
. j {=}?+M
2.To reveal the Property Zones: "15frr?
a.Right-click in the Design View and select View Preferences to display this
[W <j
dialog box. Jk{v (W#
b.On the Visibility tab, click the Property Zone check box to turn it on. .uN(44^ +x
c.Click OK. XQ}7.u!
You will see the wire frame rendering of the spherical bumps on the 07ppq?,y
bottom surface, and a solid color above it. The solid color is the 3D texture r ]~]-VZ/
of the BEFs (brightness-enhancing films) built automatically by the utility.
