The default number of bumps is 100 (10 X 10). You need to change these Z=: oI Ae
parameters to match your design. Note that LightTools allows many other ;O YwZ
placement options, but you will use the Bezier placement option for this qZ!1>` B
example. r#{r]q_E*
5.On both the X Placement tab and Y Placement tab, change the Number of ?e |'I"
Bumps parameter to 300, as shown in the following figure. Click Apply after ivd w1g|)h
each change. o z } p]l7
6.Click OK to close the dialog box. &`7~vA&c
Note that the number of bumps is 300 X 300, which results in about 90,000 _/[n/"gn
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ~A8%[.({5
manner defined by the Bezier parameterization option. Please see Chapter 5 of i '!M<>7
the LightTools Core Module User’s Guide for more information. With the <_*8a(j3
current parameter values, the Bezier option varies the bump spacing along the %EPqJ(T
length of the light guide. The spacing in the orthogonal direction is constant. YY I
The X and Y refer to the local coordinate system of the surface. Q^Ln` zMe
LightTools Introductory Tutorial * 91 A!v-[AI[
(PYUfiOf
HAPTER 5 Introduction to Backlight Design S(A0),
C zIbl[ [M&
Examining Surface Properties MCma3^/1
Using the methods described in previous chapters, you may want to check your JxQwxey{
model before you run a simulation. $"{V],:T
|
Click on various parts of the model in the 3D Design View. Or use the System ErC~,5dj;n
Navigator to select different surfaces and view their Properties. #e%.z+7I
1.In the System Navigator, click to open BottomSurface of the LightGuide, then oWyg/{M
click Zones, and then click Texture. $52Te3n
2.Select SphericalElement, and then right-click and select Properties from the QnxkD)f *0
shortcut menu. The Shape tab shows you a graphical representation of the , IUMH]D
spherical bump shape that is the bottom of the light guide. i:#R
U^ R
You might be curious as to why you cannot see the 3D texture property zones you ^JtGT
defined. They are invisible by default, because drawing thousands of texture yh_s(>sh
elements can make displaying and exploring the model somewhat slow. If you [[D}vL8d
choose to make them visible, 3D textures are displayed in wireframe, even if the wrG*1+r
display mode is set to translucent. Wireframe rendering displays a bit faster and `n-e.{O((
shows more of the technical details. i/x PO
92 * LightTools Introductory Tutorial #py7emu
d$r JW m5H
HAPTER 5 Introduction to Backlight Design z@y*
jT
C ^F?H)[0
1.Rotate and zoom the model to that you can see something like the illustration
h Z lajky
below: `Uk,5F5
. B^Ql[m&5+
2.To reveal the Property Zones: }VR&*UJE
a.Right-click in the Design View and select View Preferences to display this mQ %kGqs
dialog box. (Xq eX (s
b.On the Visibility tab, click the Property Zone check box to turn it on. C>68$wd>
c.Click OK. l O,
2
You will see the wire frame rendering of the spherical bumps on the v,>F0ofJ
bottom surface, and a solid color above it. The solid color is the 3D texture qw87B!D
of the BEFs (brightness-enhancing films) built automatically by the utility.
