The default number of bumps is 100 (10 X 10). You need to change these [F EQ@
parameters to match your design. Note that LightTools allows many other EPy/6-5b
placement options, but you will use the Bezier placement option for this pj]<i.p
example. !F)o X7"
5.On both the X Placement tab and Y Placement tab, change the Number of <=M }[
Bumps parameter to 300, as shown in the following figure. Click Apply after #KW:OFT
each change. T<)z2Bi
6.Click OK to close the dialog box. */E{s?
Note that the number of bumps is 300 X 300, which results in about 90,000 =YIQ
_,{u
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Z- (HDn
manner defined by the Bezier parameterization option. Please see Chapter 5 of >,3
3Jx
the LightTools Core Module User’s Guide for more information. With the (Ln h> '2
current parameter values, the Bezier option varies the bump spacing along the n]Y _C^
length of the light guide. The spacing in the orthogonal direction is constant. Q@n k T1o
The X and Y refer to the local coordinate system of the surface. dZmq
LightTools Introductory Tutorial * 91 O]lfs > >x
{eUfwPAa3
HAPTER 5 Introduction to Backlight Design <b I,y_<K
C }}_l@5
Examining Surface Properties [dMxr9 M
Using the methods described in previous chapters, you may want to check your &=bI3-
model before you run a simulation. [_n|n"M
Click on various parts of the model in the 3D Design View. Or use the System n TG|Isa
Navigator to select different surfaces and view their Properties. ( Ie w%U
1.In the System Navigator, click to open BottomSurface of the LightGuide, then a0.XJR{T"
click Zones, and then click Texture. *gVv74;;
2.Select SphericalElement, and then right-click and select Properties from the NY
x4&
*le
shortcut menu. The Shape tab shows you a graphical representation of the =Frr#t!(w0
spherical bump shape that is the bottom of the light guide. 6-"&jbvm
You might be curious as to why you cannot see the 3D texture property zones you 3yN1cd"#?
defined. They are invisible by default, because drawing thousands of texture .U_=LV]C
elements can make displaying and exploring the model somewhat slow. If you 9 lv 2
choose to make them visible, 3D textures are displayed in wireframe, even if the if>] )g2lr
display mode is set to translucent. Wireframe rendering displays a bit faster and &bQ^J%\
shows more of the technical details. e-mlvi^-
92 * LightTools Introductory Tutorial 4a-wGx #h
^MUM04l
HAPTER 5 Introduction to Backlight Design |:z%7J3wP
C mLE`IKgd]
1.Rotate and zoom the model to that you can see something like the illustration z@~rm9d
below: G <'S
.
t2iFd?
2.To reveal the Property Zones: d@ hJ=-4
a.Right-click in the Design View and select View Preferences to display this zYgLGwi{
dialog box. J++D\x#@
b.On the Visibility tab, click the Property Zone check box to turn it on. A7H=#L +C
c.Click OK. LKa_ofY
You will see the wire frame rendering of the spherical bumps on the Sgj6tH2M
bottom surface, and a solid color above it. The solid color is the 3D texture o/R-1\Dn
of the BEFs (brightness-enhancing films) built automatically by the utility.
