The default number of bumps is 100 (10 X 10). You need to change these "kK IVlC
parameters to match your design. Note that LightTools allows many other x hFQ jV?V
placement options, but you will use the Bezier placement option for this o4b!U %
example. _= _]Yx
5.On both the X Placement tab and Y Placement tab, change the Number of q)ygSOtj
Bumps parameter to 300, as shown in the following figure. Click Apply after PomX@N}1
each change. S< <xlW
6.Click OK to close the dialog box. g no V>ON0
Note that the number of bumps is 300 X 300, which results in about 90,000 pQxaT$
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a HB4Hz0Fa
manner defined by the Bezier parameterization option. Please see Chapter 5 of B(mxW8y
the LightTools Core Module User’s Guide for more information. With the G^F4 c{3c~
current parameter values, the Bezier option varies the bump spacing along the 0C}7=_?
length of the light guide. The spacing in the orthogonal direction is constant. Hm+-gI3*
The X and Y refer to the local coordinate system of the surface. x, js}Mlw
LightTools Introductory Tutorial * 91 1WPDMLuN
?r QMOJR
HAPTER 5 Introduction to Backlight Design *_$%Tv.]
C !b*lL#s,Y
Examining Surface Properties qphN
Using the methods described in previous chapters, you may want to check your 6-#f1D 6
model before you run a simulation. A>$VkGo
Click on various parts of the model in the 3D Design View. Or use the System J!
>HT'M
Navigator to select different surfaces and view their Properties. #Xri%&~
1.In the System Navigator, click to open BottomSurface of the LightGuide, then | zj$p~
click Zones, and then click Texture. 6:B[8otQ
2.Select SphericalElement, and then right-click and select Properties from the } VE[ W
shortcut menu. The Shape tab shows you a graphical representation of the %#NaM\=8v
spherical bump shape that is the bottom of the light guide. vhEPk2wD,
You might be curious as to why you cannot see the 3D texture property zones you kF~}h tv.=
defined. They are invisible by default, because drawing thousands of texture T IPb ]
elements can make displaying and exploring the model somewhat slow. If you :>'^l?b'WX
choose to make them visible, 3D textures are displayed in wireframe, even if the #GK&{)$
display mode is set to translucent. Wireframe rendering displays a bit faster and mqk~Pno|<
shows more of the technical details. BpCzmU
92 * LightTools Introductory Tutorial
:X F;v
l_u1 ~ K
HAPTER 5 Introduction to Backlight Design IBU(Hm1,
C 6 Pl$DSu
1.Rotate and zoom the model to that you can see something like the illustration @5zL4n@w
below: Qg?^%O'
. c\.4 I4uy
2.To reveal the Property Zones: [e ;K$
a.Right-click in the Design View and select View Preferences to display this PBr-< J
dialog box. -zHJ#
b.On the Visibility tab, click the Property Zone check box to turn it on. K|Std)6
c.Click OK. GfY!~J
You will see the wire frame rendering of the spherical bumps on the Gw 3|"14
bottom surface, and a solid color above it. The solid color is the 3D texture ?D\6CsNp(2
of the BEFs (brightness-enhancing films) built automatically by the utility.
