The default number of bumps is 100 (10 X 10). You need to change these B o.x
parameters to match your design. Note that LightTools allows many other (\.[pj%-O
placement options, but you will use the Bezier placement option for this -'3vQXj&
example. n_AW0i .
5.On both the X Placement tab and Y Placement tab, change the Number of f(
hK>H
Bumps parameter to 300, as shown in the following figure. Click Apply after vTQ Q d@
each change. ?c"No|@+
6.Click OK to close the dialog box. cQzd0X
Note that the number of bumps is 300 X 300, which results in about 90,000 jpZX5_o
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a aoz+g,1
//
manner defined by the Bezier parameterization option. Please see Chapter 5 of ;gy_Q f2U
the LightTools Core Module User’s Guide for more information. With the 6Bmv1n[X^h
current parameter values, the Bezier option varies the bump spacing along the HI#}M|4n
length of the light guide. The spacing in the orthogonal direction is constant. "w= p@ /C
The X and Y refer to the local coordinate system of the surface. NS-u,5Jt
LightTools Introductory Tutorial * 91 ~xGWL%og
EK_NN<So#
HAPTER 5 Introduction to Backlight Design G%;XJsFGp
C @jN!j*Y H
Examining Surface Properties KCq qwGM
Using the methods described in previous chapters, you may want to check your 5*[zIKdt2
model before you run a simulation. l Vo](#W
Click on various parts of the model in the 3D Design View. Or use the System 1Ls@|
Navigator to select different surfaces and view their Properties. )9##mUt'}
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Vm_y,;/(-R
click Zones, and then click Texture. M3K+;-n^
2.Select SphericalElement, and then right-click and select Properties from the E 0\ '
shortcut menu. The Shape tab shows you a graphical representation of the ss T o?WL|
spherical bump shape that is the bottom of the light guide. [ hm/B`t*e
You might be curious as to why you cannot see the 3D texture property zones you 35) ]R`f
defined. They are invisible by default, because drawing thousands of texture *y5d&4G2
elements can make displaying and exploring the model somewhat slow. If you eT[ ,k[#q
choose to make them visible, 3D textures are displayed in wireframe, even if the s!nFc{
display mode is set to translucent. Wireframe rendering displays a bit faster and :m_0WT
shows more of the technical details. ,[,+ _A
92 * LightTools Introductory Tutorial J*U,kyYF
3%{XJV
HAPTER 5 Introduction to Backlight Design }h5pM`|1
C zOLt)2-<
1.Rotate and zoom the model to that you can see something like the illustration K_ Y0 ;!W
below: {F6hx9?
. J
[2 ;&-@
2.To reveal the Property Zones: D@^ r
a.Right-click in the Design View and select View Preferences to display this .=3Sm%
dialog box. 0@C`QW %m
b.On the Visibility tab, click the Property Zone check box to turn it on. zu(/ c
c.Click OK. Z$X2*k6PK
You will see the wire frame rendering of the spherical bumps on the "^;'.~@ e8
bottom surface, and a solid color above it. The solid color is the 3D texture }/x `w
of the BEFs (brightness-enhancing films) built automatically by the utility.
