The default number of bumps is 100 (10 X 10). You need to change these 3~'F^=T.Y
parameters to match your design. Note that LightTools allows many other !ZdUW]
placement options, but you will use the Bezier placement option for this aKZD4;
example. g#*N@83C
5.On both the X Placement tab and Y Placement tab, change the Number of !9NAm?Fw
Bumps parameter to 300, as shown in the following figure. Click Apply after vA `.8U 0S
each change. =)LpMTz
6.Click OK to close the dialog box. L1BpY-=
Note that the number of bumps is 300 X 300, which results in about 90,000 9x\G(w
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a st>t~a|T
manner defined by the Bezier parameterization option. Please see Chapter 5 of ;C%EF
the LightTools Core Module User’s Guide for more information. With the ?i"FdpW
current parameter values, the Bezier option varies the bump spacing along the f|)t[,c
length of the light guide. The spacing in the orthogonal direction is constant. a4YyE LXe
The X and Y refer to the local coordinate system of the surface. /0 (KKZ)
LightTools Introductory Tutorial * 91 Y@eUvz
e^T F.D?RS
HAPTER 5 Introduction to Backlight Design [OSUARm
v
C 1g+<`1=KT
Examining Surface Properties 4{pa`o3
Using the methods described in previous chapters, you may want to check your 9OB PFF
model before you run a simulation. -D(!B56_
Click on various parts of the model in the 3D Design View. Or use the System /j As`"U
Navigator to select different surfaces and view their Properties. 5[k35 c{
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ?9cy5z[
click Zones, and then click Texture. P8f-&(
2.Select SphericalElement, and then right-click and select Properties from the y C#{nUdw
shortcut menu. The Shape tab shows you a graphical representation of the tK*f8X+q
spherical bump shape that is the bottom of the light guide. w93,N+es6
You might be curious as to why you cannot see the 3D texture property zones you @UX`9]-P
defined. They are invisible by default, because drawing thousands of texture YzqhFFaj.
elements can make displaying and exploring the model somewhat slow. If you +Gko[<
choose to make them visible, 3D textures are displayed in wireframe, even if the OJaU,vQ#
display mode is set to translucent. Wireframe rendering displays a bit faster and "- sz7}Mb
shows more of the technical details. ;a"Ukh
92 * LightTools Introductory Tutorial Uan ;}X 7@
ececN{U/
HAPTER 5 Introduction to Backlight Design ;Xns 9
C .xx9tP}Xy
1.Rotate and zoom the model to that you can see something like the illustration
Nnw iH
below: v)06`G
. v*pVcBY>
2.To reveal the Property Zones: "rtmDNpL
a.Right-click in the Design View and select View Preferences to display this ~JJv 2
dialog box. B4C`3@a
b.On the Visibility tab, click the Property Zone check box to turn it on. cl:YN]BK
c.Click OK. l; 4F,iI
You will see the wire frame rendering of the spherical bumps on the fi1UUJ0
U;
bottom surface, and a solid color above it. The solid color is the 3D texture Y]PZ| G)
of the BEFs (brightness-enhancing films) built automatically by the utility.
