The default number of bumps is 100 (10 X 10). You need to change these 01+TVWKX
parameters to match your design. Note that LightTools allows many other !1bATO:x
placement options, but you will use the Bezier placement option for this *
a VT
example. 36 ]?4, .
5.On both the X Placement tab and Y Placement tab, change the Number of 2W)KfS
Bumps parameter to 300, as shown in the following figure. Click Apply after <?!%dV{z
each change. zR}vR9Ls
6.Click OK to close the dialog box. ,B,0o*qc{K
Note that the number of bumps is 300 X 300, which results in about 90,000 =%;TV Jk*a
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a X @~R <
manner defined by the Bezier parameterization option. Please see Chapter 5 of ^ pocbmg
the LightTools Core Module User’s Guide for more information. With the \Iz-<:gA'
current parameter values, the Bezier option varies the bump spacing along the ZVCa0Km
length of the light guide. The spacing in the orthogonal direction is constant. Z%VgAV>>
The X and Y refer to the local coordinate system of the surface. NcIr;
}
LightTools Introductory Tutorial * 91 G-DOI
W!a'KI'
HAPTER 5 Introduction to Backlight Design iUf?MDE
C #|
m* k
Examining Surface Properties ^ O3p :X4u
Using the methods described in previous chapters, you may want to check your u4:6zU/{
model before you run a simulation. .gw6W0\F
Click on various parts of the model in the 3D Design View. Or use the System =K 9-
Navigator to select different surfaces and view their Properties. zY&/lWW._
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ^=w){]G
click Zones, and then click Texture. 3MHByT %
2.Select SphericalElement, and then right-click and select Properties from the z s[zB #
shortcut menu. The Shape tab shows you a graphical representation of the pA@BW:#
spherical bump shape that is the bottom of the light guide. F^ 7qr
You might be curious as to why you cannot see the 3D texture property zones you ODPWFdRar
defined. They are invisible by default, because drawing thousands of texture ezr'"1Ba}
elements can make displaying and exploring the model somewhat slow. If you 6W N(Tw
choose to make them visible, 3D textures are displayed in wireframe, even if the 2 57q%"
display mode is set to translucent. Wireframe rendering displays a bit faster and Gq.fQ_oOb
shows more of the technical details. j.29nJ
92 * LightTools Introductory Tutorial ^FK-e;J
W_| 7hwr
HAPTER 5 Introduction to Backlight Design >]?!9 @#IH
C O J)XJL
1.Rotate and zoom the model to that you can see something like the illustration x )e(g}n
below: g|x* sZR~Y
. VOrBNu
2.To reveal the Property Zones: 2?c%<_jPA
a.Right-click in the Design View and select View Preferences to display this h%U,g
9_
dialog box. e|.a%,Dcy
b.On the Visibility tab, click the Property Zone check box to turn it on. *6]_ 6xO
c.Click OK. /Au7X'}
You will see the wire frame rendering of the spherical bumps on the 3xpygx9
bottom surface, and a solid color above it. The solid color is the 3D texture `FIS2sl /
of the BEFs (brightness-enhancing films) built automatically by the utility.
