The default number of bumps is 100 (10 X 10). You need to change these 8UY[ $lc
parameters to match your design. Note that LightTools allows many other RM/q\100
placement options, but you will use the Bezier placement option for this 0)=U:y.
example. >NL4& MV:
5.On both the X Placement tab and Y Placement tab, change the Number of VJp; XM
Bumps parameter to 300, as shown in the following figure. Click Apply after "Dr8}g:X
each change. pP JhF8Dt
6.Click OK to close the dialog box. C !a#M{:
Note that the number of bumps is 300 X 300, which results in about 90,000 Km UH([#
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Rn(6Fk?
manner defined by the Bezier parameterization option. Please see Chapter 5 of [FhFeW>
the LightTools Core Module User’s Guide for more information. With the x6- bAf
current parameter values, the Bezier option varies the bump spacing along the F#<$yUf%
length of the light guide. The spacing in the orthogonal direction is constant. ,E Y B
E
The X and Y refer to the local coordinate system of the surface. rd#O ]
LightTools Introductory Tutorial * 91 /*v} .fH%
ZboY]1L[j
HAPTER 5 Introduction to Backlight Design t|/{oAj
C =a!w)z_rw
Examining Surface Properties ?H7Ym N
Using the methods described in previous chapters, you may want to check your IYZ$a/{P
model before you run a simulation. ZT;8Wvo
Click on various parts of the model in the 3D Design View. Or use the System 9d5|rk8VS
Navigator to select different surfaces and view their Properties. jv<C#0E^
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 9^D5Sl$g
click Zones, and then click Texture. \piH dVD
2.Select SphericalElement, and then right-click and select Properties from the K<#Q;(SF U
shortcut menu. The Shape tab shows you a graphical representation of the x(r>iy
spherical bump shape that is the bottom of the light guide. 2m! T . $
You might be curious as to why you cannot see the 3D texture property zones you R]Iv?) Y
defined. They are invisible by default, because drawing thousands of texture P LHiQ:
elements can make displaying and exploring the model somewhat slow. If you .=I:cniw\r
choose to make them visible, 3D textures are displayed in wireframe, even if the ONc-jU^
display mode is set to translucent. Wireframe rendering displays a bit faster and yu^n;gWH
shows more of the technical details. i.~*G8!DM
92 * LightTools Introductory Tutorial 2. 6F5&:($
Hutwg Pvy
HAPTER 5 Introduction to Backlight Design / *$B
C wO>P< KBU
1.Rotate and zoom the model to that you can see something like the illustration e<.O'!=7Y
below: LBCat=d<
. ho J{C 0
2.To reveal the Property Zones: \DDR l{
a.Right-click in the Design View and select View Preferences to display this ZKk*2EK]2z
dialog box. G\\0N^v
b.On the Visibility tab, click the Property Zone check box to turn it on. ?WD JWp%
c.Click OK. f&ZFG>)6
You will see the wire frame rendering of the spherical bumps on the :4HZ >!i
bottom surface, and a solid color above it. The solid color is the 3D texture ggP#2I\
of the BEFs (brightness-enhancing films) built automatically by the utility.
