The default number of bumps is 100 (10 X 10). You need to change these %)u5A !"
parameters to match your design. Note that LightTools allows many other E;9SsA
placement options, but you will use the Bezier placement option for this qbFzA
i
example. z9u"?vdA
5.On both the X Placement tab and Y Placement tab, change the Number of J'.U+X U
Bumps parameter to 300, as shown in the following figure. Click Apply after zf4@:GM`
each change. VLkK6W.u
6.Click OK to close the dialog box. e(,sFhR
Note that the number of bumps is 300 X 300, which results in about 90,000 owJPEx
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a {{SeD:hx
manner defined by the Bezier parameterization option. Please see Chapter 5 of y!)Z ^u
the LightTools Core Module User’s Guide for more information. With the iw1 2x:
current parameter values, the Bezier option varies the bump spacing along the y`! 3Z} 7
length of the light guide. The spacing in the orthogonal direction is constant. $@7 S+'Q3
The X and Y refer to the local coordinate system of the surface. r,EIOc z:
LightTools Introductory Tutorial * 91 XW%!#S&;X
P<km?\Xp(
HAPTER 5 Introduction to Backlight Design OtrO"K
C 4-lEo{IIM
Examining Surface Properties Ck/4 h Z
Using the methods described in previous chapters, you may want to check your =;i@,{
~
model before you run a simulation. )CSb\
Click on various parts of the model in the 3D Design View. Or use the System I.euuzBgA
Navigator to select different surfaces and view their Properties. #xNLr
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Tmg~ZI:MW
click Zones, and then click Texture. K #}DXq
2.Select SphericalElement, and then right-click and select Properties from the AN\ :
shortcut menu. The Shape tab shows you a graphical representation of the tz6d}$
spherical bump shape that is the bottom of the light guide. MrXhVZ"d*
You might be curious as to why you cannot see the 3D texture property zones you U(3{6^>Gc
defined. They are invisible by default, because drawing thousands of texture O)kC[e4
elements can make displaying and exploring the model somewhat slow. If you 9pb4!=g*
choose to make them visible, 3D textures are displayed in wireframe, even if the 3;u* _ ]N_
display mode is set to translucent. Wireframe rendering displays a bit faster and a.y_o50#T
shows more of the technical details. 1aS[e% 9Mg
92 * LightTools Introductory Tutorial A_muuOIcI
4Sf v
HAPTER 5 Introduction to Backlight Design $,bLK|<hi
C 6NVf&;laQ
1.Rotate and zoom the model to that you can see something like the illustration f|cd_?|
below: Wt"fn&R}
. H $ 9--p
2.To reveal the Property Zones: 3tMs61 3
a.Right-click in the Design View and select View Preferences to display this &s>H iL>f
dialog box. |-bSoq7t
b.On the Visibility tab, click the Property Zone check box to turn it on. mA|! IhM
c.Click OK. Q?B5@J
You will see the wire frame rendering of the spherical bumps on the Ysz{~E'
bottom surface, and a solid color above it. The solid color is the 3D texture XI~2Vzht
of the BEFs (brightness-enhancing films) built automatically by the utility.
