The default number of bumps is 100 (10 X 10). You need to change these
B`wrr8"Rz
parameters to match your design. Note that LightTools allows many other i1 6kPU
placement options, but you will use the Bezier placement option for this bW^JR,
example. z` (">J
5.On both the X Placement tab and Y Placement tab, change the Number of WWG+0jQ9
Bumps parameter to 300, as shown in the following figure. Click Apply after eq,`T;
each change. aKC,{}f$m
6.Click OK to close the dialog box. %hCd*[Z}j
Note that the number of bumps is 300 X 300, which results in about 90,000 G*%:"qleT$
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a JUd Q Q
manner defined by the Bezier parameterization option. Please see Chapter 5 of E8"$vl&c]
the LightTools Core Module User’s Guide for more information. With the Lf+"G p
current parameter values, the Bezier option varies the bump spacing along the ^vha4<'-qG
length of the light guide. The spacing in the orthogonal direction is constant. 3V%ts7: a
The X and Y refer to the local coordinate system of the surface. V?&P).5)
LightTools Introductory Tutorial * 91 |ZtNCB5{^j
' mO>hD `V
HAPTER 5 Introduction to Backlight Design J/B `c(
C +a0` ,Jc
Examining Surface Properties #dDM
" s
Using the methods described in previous chapters, you may want to check your U6F1QLSLz
model before you run a simulation. 6o<(,\ad [
Click on various parts of the model in the 3D Design View. Or use the System OU'm0Jlk
Navigator to select different surfaces and view their Properties. t$g@+1p4
1.In the System Navigator, click to open BottomSurface of the LightGuide, then v:?l C<,
click Zones, and then click Texture. ]_43U` [#
2.Select SphericalElement, and then right-click and select Properties from the qrufnu5cC
shortcut menu. The Shape tab shows you a graphical representation of the t[o_!fmxZ
spherical bump shape that is the bottom of the light guide. cUC!'+L
You might be curious as to why you cannot see the 3D texture property zones you .X34[AXd
defined. They are invisible by default, because drawing thousands of texture 2B"&WKk
elements can make displaying and exploring the model somewhat slow. If you P(cy@P,D
choose to make them visible, 3D textures are displayed in wireframe, even if the #eIFRNRb)
display mode is set to translucent. Wireframe rendering displays a bit faster and h&2l0 |8k
shows more of the technical details. FwUgMR*xq
92 * LightTools Introductory Tutorial OxqkpK&
k8 z1AP
HAPTER 5 Introduction to Backlight Design Bu"5NB
C 58P[EM hL
1.Rotate and zoom the model to that you can see something like the illustration n }/ 4em?
below: K/ M2L&C
. nYE%@Up
2.To reveal the Property Zones: |dhKe g_
a.Right-click in the Design View and select View Preferences to display this 9J$-E4G.M
dialog box. Y&-%
N
b.On the Visibility tab, click the Property Zone check box to turn it on. * " + u^
c.Click OK. `#"xgOSP>
You will see the wire frame rendering of the spherical bumps on the ?z&5g -/b
bottom surface, and a solid color above it. The solid color is the 3D texture w|c200Is}e
of the BEFs (brightness-enhancing films) built automatically by the utility.
