The default number of bumps is 100 (10 X 10). You need to change these D) P ._?
parameters to match your design. Note that LightTools allows many other S@tLCqV 4
placement options, but you will use the Bezier placement option for this >6-`}G+|
example. G4;Oi=
5.On both the X Placement tab and Y Placement tab, change the Number of 6_;ic pN]
Bumps parameter to 300, as shown in the following figure. Click Apply after 4 "ZP 'I;
each change. S13nL^ =i
6.Click OK to close the dialog box. a-tm q]]E
Note that the number of bumps is 300 X 300, which results in about 90,000 #X$\&,Yn"
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a {S \{Ii6
manner defined by the Bezier parameterization option. Please see Chapter 5 of DCa^
u'f
the LightTools Core Module User’s Guide for more information. With the = svN#q5s
current parameter values, the Bezier option varies the bump spacing along the H8jpxzXv
length of the light guide. The spacing in the orthogonal direction is constant. y.k~Y0
The X and Y refer to the local coordinate system of the surface. 4_lrg|X1
LightTools Introductory Tutorial * 91 wHLLu~m\
TX/Xt7#R:
HAPTER 5 Introduction to Backlight Design ej d(R+
C _f,C[C[e&
Examining Surface Properties T!{w~'=F
Using the methods described in previous chapters, you may want to check your o-HT1Hc!
model before you run a simulation. 0mVN QxHI
Click on various parts of the model in the 3D Design View. Or use the System ="H%6S4'
Navigator to select different surfaces and view their Properties. HiFUv >,u
1.In the System Navigator, click to open BottomSurface of the LightGuide, then H?W ya.7
click Zones, and then click Texture. gH vZ VC[b
2.Select SphericalElement, and then right-click and select Properties from the @mBQ?; qlK
shortcut menu. The Shape tab shows you a graphical representation of the 0+ '&`Q!u
spherical bump shape that is the bottom of the light guide. !qg`/y9
You might be curious as to why you cannot see the 3D texture property zones you vr l-$ii
defined. They are invisible by default, because drawing thousands of texture 7]bGc
\
elements can make displaying and exploring the model somewhat slow. If you ^ytrK
Q
choose to make them visible, 3D textures are displayed in wireframe, even if the +sA2WK]
display mode is set to translucent. Wireframe rendering displays a bit faster and *^4"5X @
shows more of the technical details. eByz-,{P
92 * LightTools Introductory Tutorial =nS3p6>rZ
*&W"bOMH*
HAPTER 5 Introduction to Backlight Design HC8e>kP9b
C WH} y"W
1.Rotate and zoom the model to that you can see something like the illustration NI]N4[8(
below: jr. "I+
. F>l]
9!P|m
2.To reveal the Property Zones: ,4$>,@WW~
a.Right-click in the Design View and select View Preferences to display this AT3Mlz~7#
dialog box. }0z)5c
b.On the Visibility tab, click the Property Zone check box to turn it on. O/C rd/
c.Click OK. m (!FHPvN
You will see the wire frame rendering of the spherical bumps on the Kc-W&?~y#1
bottom surface, and a solid color above it. The solid color is the 3D texture t*u:hex
of the BEFs (brightness-enhancing films) built automatically by the utility.
