The default number of bumps is 100 (10 X 10). You need to change these I 82GZL
parameters to match your design. Note that LightTools allows many other LR%]4$ /M
placement options, but you will use the Bezier placement option for this f0S$p
R
example. wF[%+n (*
5.On both the X Placement tab and Y Placement tab, change the Number of lf-1;6nyk"
Bumps parameter to 300, as shown in the following figure. Click Apply after usc"m huQ
each change. P-U9FKrt
6.Click OK to close the dialog box. Cj'X L}
Note that the number of bumps is 300 X 300, which results in about 90,000 ;auT!a~a#
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a {_C2 c{
manner defined by the Bezier parameterization option. Please see Chapter 5 of 9(eTCe-~6
the LightTools Core Module User’s Guide for more information. With the Y#7sDd!N|
current parameter values, the Bezier option varies the bump spacing along the SI\
O>a 9{
length of the light guide. The spacing in the orthogonal direction is constant. P OB6#x
The X and Y refer to the local coordinate system of the surface. ~T">)Y~+xI
LightTools Introductory Tutorial * 91 WstX>+?'
l d
HAPTER 5 Introduction to Backlight Design K-<<s
C dT?mMTKn+
Examining Surface Properties 3'2>3Y/7Bb
Using the methods described in previous chapters, you may want to check your +@G#Z3;l!
model before you run a simulation. \
]v>#VXr_
Click on various parts of the model in the 3D Design View. Or use the System '8Wu9 phT
Navigator to select different surfaces and view their Properties. s`#g<_ {X
1.In the System Navigator, click to open BottomSurface of the LightGuide, then E/OfkL*\
click Zones, and then click Texture. 8GlRO 4yd
2.Select SphericalElement, and then right-click and select Properties from the oDW)2*8yF
shortcut menu. The Shape tab shows you a graphical representation of the q!f'?yFYK
spherical bump shape that is the bottom of the light guide. [$]qJ~kz
You might be curious as to why you cannot see the 3D texture property zones you `]F}O \H
defined. They are invisible by default, because drawing thousands of texture tw
k
elements can make displaying and exploring the model somewhat slow. If you \&BT#8ELG
choose to make them visible, 3D textures are displayed in wireframe, even if the <*_DC)&7 9
display mode is set to translucent. Wireframe rendering displays a bit faster and b,h Rk1
shows more of the technical details. [jnA? Ge:
92 * LightTools Introductory Tutorial NWue;u^
&a8%j+j
HAPTER 5 Introduction to Backlight Design lq}m0}9<
C _ kEU=)Xe
1.Rotate and zoom the model to that you can see something like the illustration \$+#7( K
below: Fe L !%z
. ,eSII2,r4
2.To reveal the Property Zones: F81Kxcs
a.Right-click in the Design View and select View Preferences to display this R+r;V ]-/
dialog box. /JjSx/
b.On the Visibility tab, click the Property Zone check box to turn it on. F e1^9ja
c.Click OK. .C|dGE?,
You will see the wire frame rendering of the spherical bumps on the # KUN ZW
bottom surface, and a solid color above it. The solid color is the 3D texture Lr j p
of the BEFs (brightness-enhancing films) built automatically by the utility.
