The default number of bumps is 100 (10 X 10). You need to change these
S_P&Fv
parameters to match your design. Note that LightTools allows many other w;O-A TUzN
placement options, but you will use the Bezier placement option for this 6Z_V,LD9L
example. ;M~,S^U
5.On both the X Placement tab and Y Placement tab, change the Number of `+,?%W)
Bumps parameter to 300, as shown in the following figure. Click Apply after <x}wy+SG
each change. `etw[#~N
6.Click OK to close the dialog box. xS|9Gk
Note that the number of bumps is 300 X 300, which results in about 90,000 8_%GH}{
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a JvAXLT
manner defined by the Bezier parameterization option. Please see Chapter 5 of ' [$KG
the LightTools Core Module User’s Guide for more information. With the M/o?D <'
current parameter values, the Bezier option varies the bump spacing along the kLgkUck8]
length of the light guide. The spacing in the orthogonal direction is constant. y0xBNhev
The X and Y refer to the local coordinate system of the surface. #}^waYAk)
LightTools Introductory Tutorial * 91 4/(#masIL
hz:7 W8
HAPTER 5 Introduction to Backlight Design 'zUV(K?2]
C m9[ 7"I
Examining Surface Properties / b,>fK^
Using the methods described in previous chapters, you may want to check your </25J((
model before you run a simulation. ' 4'Z
Click on various parts of the model in the 3D Design View. Or use the System 'h$1
z$X5
Navigator to select different surfaces and view their Properties. l[E^nh >
1.In the System Navigator, click to open BottomSurface of the LightGuide, then c,1 G+.
click Zones, and then click Texture. w9|x{B
2.Select SphericalElement, and then right-click and select Properties from the Biv)s@"f-Q
shortcut menu. The Shape tab shows you a graphical representation of the [ c B^6v
spherical bump shape that is the bottom of the light guide. $FPq8$V
You might be curious as to why you cannot see the 3D texture property zones you _HwA%=>7
defined. They are invisible by default, because drawing thousands of texture AS;S z/YP
elements can make displaying and exploring the model somewhat slow. If you fG0ZVV!
choose to make them visible, 3D textures are displayed in wireframe, even if the xa)p ,
display mode is set to translucent. Wireframe rendering displays a bit faster and _^_3>}y5op
shows more of the technical details. ](JrEg$K
92 * LightTools Introductory Tutorial ]
2
`%i5
%"{P?V<-V
HAPTER 5 Introduction to Backlight Design zmhc\M ?z
C +?)7 l
1.Rotate and zoom the model to that you can see something like the illustration -E}X`?WhD
below: B{/og*xd*1
. )c11_1;
2.To reveal the Property Zones: F~Dof({:
a.Right-click in the Design View and select View Preferences to display this BH'*I
yv
dialog box. xL15uWk-
b.On the Visibility tab, click the Property Zone check box to turn it on. ST{Vi';}
c.Click OK. }#7 l-@{<
You will see the wire frame rendering of the spherical bumps on the qm_l#
u6
bottom surface, and a solid color above it. The solid color is the 3D texture zQ+Mu^|u+
of the BEFs (brightness-enhancing films) built automatically by the utility.
