The default number of bumps is 100 (10 X 10). You need to change these 7PisX!c,h
parameters to match your design. Note that LightTools allows many other .qVdo+M%F
placement options, but you will use the Bezier placement option for this LZ oth+:
example.
u*9C(je
5.On both the X Placement tab and Y Placement tab, change the Number of BR0bf 5T/
Bumps parameter to 300, as shown in the following figure. Click Apply after _O rE{
each change. Jx{,x-I
6.Click OK to close the dialog box. G4RsH/
Note that the number of bumps is 300 X 300, which results in about 90,000 k~q[qKb8y:
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a m.^6e f
manner defined by the Bezier parameterization option. Please see Chapter 5 of F(XWnfUv
the LightTools Core Module User’s Guide for more information. With the D:F!;n9
current parameter values, the Bezier option varies the bump spacing along the >Y \4 v}-
length of the light guide. The spacing in the orthogonal direction is constant. \4vFEJSh
The X and Y refer to the local coordinate system of the surface. x`lBG%Y[-v
LightTools Introductory Tutorial * 91 Mq7|37(N[
9Q. j
<
HAPTER 5 Introduction to Backlight Design P{qn@:
C &c\8` # 6
Examining Surface Properties K GI]W|T
Using the methods described in previous chapters, you may want to check your tP:xx2N_
model before you run a simulation. Awr]@%I
Click on various parts of the model in the 3D Design View. Or use the System # 15q`w
Navigator to select different surfaces and view their Properties. 'PO1{&M
1.In the System Navigator, click to open BottomSurface of the LightGuide, then R -h7c!ko
click Zones, and then click Texture. I+<; D sp
2.Select SphericalElement, and then right-click and select Properties from the S`l CynGH
shortcut menu. The Shape tab shows you a graphical representation of the /z'j:~`E
spherical bump shape that is the bottom of the light guide. keWgbj
You might be curious as to why you cannot see the 3D texture property zones you *Zc-&Dk:Ir
defined. They are invisible by default, because drawing thousands of texture 1u` Z?S(
elements can make displaying and exploring the model somewhat slow. If you N&GcWcq
choose to make them visible, 3D textures are displayed in wireframe, even if the h T
Xc0
display mode is set to translucent. Wireframe rendering displays a bit faster and T }8aj
shows more of the technical details. :5Vu .\,1
92 * LightTools Introductory Tutorial ' 5Ieqpm9
tou^p-)GQ|
HAPTER 5 Introduction to Backlight Design ut Tek5/
C TxiJ?sDh*
1.Rotate and zoom the model to that you can see something like the illustration 2
43DdIG$
below: !*cf}<Kmw
. \UC4ai2MK
2.To reveal the Property Zones: '*-SvA\Cx
a.Right-click in the Design View and select View Preferences to display this y>#j4%D~4
dialog box. z7K?rgH
b.On the Visibility tab, click the Property Zone check box to turn it on. Qz<-xe`o8]
c.Click OK. m&%N4Q~X>
You will see the wire frame rendering of the spherical bumps on the vd ;wQ
bottom surface, and a solid color above it. The solid color is the 3D texture 81n%2G
of the BEFs (brightness-enhancing films) built automatically by the utility.
