The default number of bumps is 100 (10 X 10). You need to change these H1 e^/JD)
parameters to match your design. Note that LightTools allows many other cpQhg-LY|
placement options, but you will use the Bezier placement option for this V3[>^ZCA
example. Zrp9`~_g<!
5.On both the X Placement tab and Y Placement tab, change the Number of lt|UehJ F
Bumps parameter to 300, as shown in the following figure. Click Apply after Ew2ksZ>B]&
each change. cxxrvP-
6.Click OK to close the dialog box. p 4Y 2AQ9
Note that the number of bumps is 300 X 300, which results in about 90,000 fHacVj J
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a =aRE
manner defined by the Bezier parameterization option. Please see Chapter 5 of vL Qh r&I
the LightTools Core Module User’s Guide for more information. With the 9 [wR/8Xm
current parameter values, the Bezier option varies the bump spacing along the J 0yo@O
length of the light guide. The spacing in the orthogonal direction is constant. g({dD ;
The X and Y refer to the local coordinate system of the surface. $-lP"m@}
LightTools Introductory Tutorial * 91 2@a]x(
oT[8Iu
HAPTER 5 Introduction to Backlight Design T0lbMp
C ~ MW_=6U
Examining Surface Properties r&D&xsbQ
Using the methods described in previous chapters, you may want to check your :\,3=suWq
model before you run a simulation. B#K2?Et!t
Click on various parts of the model in the 3D Design View. Or use the System "hXB_73)V
Navigator to select different surfaces and view their Properties. b;$j h
1.In the System Navigator, click to open BottomSurface of the LightGuide, then qb$f ,E[
click Zones, and then click Texture. r^!P=BS{
2.Select SphericalElement, and then right-click and select Properties from the v`9n'+h-c6
shortcut menu. The Shape tab shows you a graphical representation of the r?wE ;gH
spherical bump shape that is the bottom of the light guide. 'E ~[I"0
You might be curious as to why you cannot see the 3D texture property zones you }~$96|J
defined. They are invisible by default, because drawing thousands of texture @G0j/@v
elements can make displaying and exploring the model somewhat slow. If you \&5t @sC
choose to make them visible, 3D textures are displayed in wireframe, even if the % yP*Vp,W
display mode is set to translucent. Wireframe rendering displays a bit faster and Wo~#R
shows more of the technical details. yf7$m_$C'
92 * LightTools Introductory Tutorial 9UeK}Rl^n
b+ J)
HAPTER 5 Introduction to Backlight Design +)l6%QKcW
C {h *Pkn1
1.Rotate and zoom the model to that you can see something like the illustration VJ$UpqVm
below: :,BKB*a\
. |HMpVT-;j
2.To reveal the Property Zones: xk$U+8K
a.Right-click in the Design View and select View Preferences to display this i& y bvTl
dialog box. q/HwcX+[b
b.On the Visibility tab, click the Property Zone check box to turn it on. ::A ]p@
c.Click OK. h$~ \to$C
You will see the wire frame rendering of the spherical bumps on the ]M5w!O!
bottom surface, and a solid color above it. The solid color is the 3D texture ESt@%7.F
of the BEFs (brightness-enhancing films) built automatically by the utility.
