The default number of bumps is 100 (10 X 10). You need to change these gLsU:aeC T
parameters to match your design. Note that LightTools allows many other :|1.seLQ
placement options, but you will use the Bezier placement option for this <:|3rfm#
example. O3o: qly!
5.On both the X Placement tab and Y Placement tab, change the Number of 8I,QD`
xu
Bumps parameter to 300, as shown in the following figure. Click Apply after 3CE[(
each change. #;# 3%?
6.Click OK to close the dialog box. \ /|)HElKR
Note that the number of bumps is 300 X 300, which results in about 90,000 +!0eu>~_&
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a s4H2/EC
manner defined by the Bezier parameterization option. Please see Chapter 5 of j 6ut}Uq
the LightTools Core Module User’s Guide for more information. With the bqx0d=Z~[
current parameter values, the Bezier option varies the bump spacing along the OJ4Sb I
length of the light guide. The spacing in the orthogonal direction is constant. GYB+RU}],
The X and Y refer to the local coordinate system of the surface. H0"= Vs,n
LightTools Introductory Tutorial * 91 9tg)Mo%
D,ly#Nn
HAPTER 5 Introduction to Backlight Design 6*@yE
C E N !?: RV
Examining Surface Properties insY(.N
Using the methods described in previous chapters, you may want to check your nF)uTk
model before you run a simulation. /b,TpuM^
Click on various parts of the model in the 3D Design View. Or use the System tK%c@gGU9
Navigator to select different surfaces and view their Properties. D';eTy Y
1.In the System Navigator, click to open BottomSurface of the LightGuide, then N6Z{BLZ
click Zones, and then click Texture. s4T}Bs r
2.Select SphericalElement, and then right-click and select Properties from the xeTgV&$@
shortcut menu. The Shape tab shows you a graphical representation of the E&~nps8e
spherical bump shape that is the bottom of the light guide. iz"3\{aN
You might be curious as to why you cannot see the 3D texture property zones you Cpx+qQt0
defined. They are invisible by default, because drawing thousands of texture y~< @x.
elements can make displaying and exploring the model somewhat slow. If you A N9[ G
choose to make them visible, 3D textures are displayed in wireframe, even if the 'q%%m/,VPQ
display mode is set to translucent. Wireframe rendering displays a bit faster and ,,=apyr#&
shows more of the technical details. g2p"LWex-
92 * LightTools Introductory Tutorial +K6szGP
bZipm( e
HAPTER 5 Introduction to Backlight Design < Mf*l)%*
C HT`1E0G8)
1.Rotate and zoom the model to that you can see something like the illustration 0NO1M)HQv
below: EA{U!b]cU
. x|~ zHFm6
2.To reveal the Property Zones: mxqG-*ch-
a.Right-click in the Design View and select View Preferences to display this ] y1f M0
dialog box. _`a&9i
&
b.On the Visibility tab, click the Property Zone check box to turn it on. XY+y}D
%
c.Click OK. 2>hz_o{5',
You will see the wire frame rendering of the spherical bumps on the (xyS 7q]m
bottom surface, and a solid color above it. The solid color is the 3D texture "2Op[~V
of the BEFs (brightness-enhancing films) built automatically by the utility.
