The default number of bumps is 100 (10 X 10). You need to change these !`RMXUV
parameters to match your design. Note that LightTools allows many other s2NBYDi$?
placement options, but you will use the Bezier placement option for this nD X Em6|e
example. PZJ9f8 V
5.On both the X Placement tab and Y Placement tab, change the Number of Y I;iG[T,&
Bumps parameter to 300, as shown in the following figure. Click Apply after TEY~E*=}$
each change. _K!.TM+9
6.Click OK to close the dialog box. 2nC,1%kxhq
Note that the number of bumps is 300 X 300, which results in about 90,000 : >;F4gGVG
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ;Su-Y!& %
manner defined by the Bezier parameterization option. Please see Chapter 5 of pc 0{
the LightTools Core Module User’s Guide for more information. With the .?Y"o3
current parameter values, the Bezier option varies the bump spacing along the _fu <`|kc
length of the light guide. The spacing in the orthogonal direction is constant. /z4c>)fV
The X and Y refer to the local coordinate system of the surface. `R: W5_n
LightTools Introductory Tutorial * 91 prN+{N8YC
Dqii60
HAPTER 5 Introduction to Backlight Design D?"P\b[/
C .kg 3>*
Examining Surface Properties <7F-WR/2n
Using the methods described in previous chapters, you may want to check your <\ <o#Vq
model before you run a simulation. B+U:=591
Click on various parts of the model in the 3D Design View. Or use the System ^7gKs2M
Navigator to select different surfaces and view their Properties. oC49c~`8
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 1u7D:h>#
click Zones, and then click Texture. |,:p[Oy
2.Select SphericalElement, and then right-click and select Properties from the 8$A0 q%n
shortcut menu. The Shape tab shows you a graphical representation of the 6Q [
spherical bump shape that is the bottom of the light guide. ]q{_i
You might be curious as to why you cannot see the 3D texture property zones you 1J/'R37lP
defined. They are invisible by default, because drawing thousands of texture e
}?.3,?
elements can make displaying and exploring the model somewhat slow. If you Vi-Ph;6[
choose to make them visible, 3D textures are displayed in wireframe, even if the l7qW)<r
display mode is set to translucent. Wireframe rendering displays a bit faster and mu@ J$\
shows more of the technical details. Hrvy I)4{
92 * LightTools Introductory Tutorial (~zu4^9w
` qs}L
HAPTER 5 Introduction to Backlight Design ;[R6rVHe{
C j\~,Gtn>Z
1.Rotate and zoom the model to that you can see something like the illustration o4WQA"VxM
below: yiC7)=
. wCNn/%C
2.To reveal the Property Zones: 2I }p X9
a.Right-click in the Design View and select View Preferences to display this A8vd@ 0
dialog box. 4BCe;Q^6
b.On the Visibility tab, click the Property Zone check box to turn it on. $$NWN?H~
c.Click OK. *}lLV.+A
You will see the wire frame rendering of the spherical bumps on the !Z:XSF[T
bottom surface, and a solid color above it. The solid color is the 3D texture "nu]3zcd
of the BEFs (brightness-enhancing films) built automatically by the utility.
