The default number of bumps is 100 (10 X 10). You need to change these v21?
parameters to match your design. Note that LightTools allows many other 7^ 5BnF@
placement options, but you will use the Bezier placement option for this (P8oXb +%
example. *h9vMks
o
5.On both the X Placement tab and Y Placement tab, change the Number of i(rY'o2 BN
Bumps parameter to 300, as shown in the following figure. Click Apply after xc?<:h"
each change. >^N :A
6.Click OK to close the dialog box. `h 6W@ROb
Note that the number of bumps is 300 X 300, which results in about 90,000 =Y[ Ae7e
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a s ~G{-)*
manner defined by the Bezier parameterization option. Please see Chapter 5 of N4-J !r@#~
the LightTools Core Module User’s Guide for more information. With the Cn '=_1p
current parameter values, the Bezier option varies the bump spacing along the ~V )E:(
length of the light guide. The spacing in the orthogonal direction is constant. 3}Qh`+Yj]
The X and Y refer to the local coordinate system of the surface. cw{[B%vw
LightTools Introductory Tutorial * 91 { VO4""m
~yN,F pD
HAPTER 5 Introduction to Backlight Design CXZeL 1+
C Jmx }r,j
Examining Surface Properties W9"I++~f
Using the methods described in previous chapters, you may want to check your ")
D!OW]
model before you run a simulation. 6Tnzg`0I
Click on various parts of the model in the 3D Design View. Or use the System O6]~5&8U.
Navigator to select different surfaces and view their Properties. Y[4B{
1.In the System Navigator, click to open BottomSurface of the LightGuide, then sd%~pY}
click Zones, and then click Texture. H=C;g)R
2.Select SphericalElement, and then right-click and select Properties from the -&}E:zoe
shortcut menu. The Shape tab shows you a graphical representation of the ZbUf|#GTB
spherical bump shape that is the bottom of the light guide. KHtY
+93
You might be curious as to why you cannot see the 3D texture property zones you K-3 _4A s
defined. They are invisible by default, because drawing thousands of texture RSC-+c6 1
elements can make displaying and exploring the model somewhat slow. If you =d}3>YHS
choose to make them visible, 3D textures are displayed in wireframe, even if the TZg7BLfy
display mode is set to translucent. Wireframe rendering displays a bit faster and $(U|JR@
shows more of the technical details. $!Tw`O
92 * LightTools Introductory Tutorial {,=,0NQKn
L8ke*O$
HAPTER 5 Introduction to Backlight Design .2xkf@OP
C ZI7<E
1.Rotate and zoom the model to that you can see something like the illustration se[}; t:
below: 0J~4
. -}@9 lhS,
2.To reveal the Property Zones: >Fz$DKr[
a.Right-click in the Design View and select View Preferences to display this #ZA
YP
dialog box. UZ#2*PH2E
b.On the Visibility tab, click the Property Zone check box to turn it on. ;H lv
c.Click OK. `Z-`-IL
You will see the wire frame rendering of the spherical bumps on the
s25012
bottom surface, and a solid color above it. The solid color is the 3D texture 1oPT8 )[U
of the BEFs (brightness-enhancing films) built automatically by the utility.
