The default number of bumps is 100 (10 X 10). You need to change these 2Z Mb<b4H
parameters to match your design. Note that LightTools allows many other u:gN?O/G
placement options, but you will use the Bezier placement option for this p~^D\jR.
example. UT=tT )4b
5.On both the X Placement tab and Y Placement tab, change the Number of J^}V|#
Bumps parameter to 300, as shown in the following figure. Click Apply after PHXZ= A+
each change. 9~mh@Kgv
6.Click OK to close the dialog box. D=m9fFz
Note that the number of bumps is 300 X 300, which results in about 90,000 X=!^] 3zH
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a X>(TrdK_9"
manner defined by the Bezier parameterization option. Please see Chapter 5 of Dhw(#{N
the LightTools Core Module User’s Guide for more information. With the m)v"3ib
current parameter values, the Bezier option varies the bump spacing along the 1V4s<m>#
length of the light guide. The spacing in the orthogonal direction is constant. "UGY2skf;
The X and Y refer to the local coordinate system of the surface. IC s\
z
LightTools Introductory Tutorial * 91 =2zJ3&9
I^UC&5dC
HAPTER 5 Introduction to Backlight Design (-xS?8x$
C 57zSu3v4Y
Examining Surface Properties v~ V5` %
Using the methods described in previous chapters, you may want to check your E^lvbLh'
model before you run a simulation. W<$Z=(_v
Click on various parts of the model in the 3D Design View. Or use the System y?m/*hh`
Navigator to select different surfaces and view their Properties. Bu WHX>H
1.In the System Navigator, click to open BottomSurface of the LightGuide, then iZNts%Y]
click Zones, and then click Texture. 0Lc9M-Lg
2.Select SphericalElement, and then right-click and select Properties from the cc&axc7I
shortcut menu. The Shape tab shows you a graphical representation of the [ }/LD3
spherical bump shape that is the bottom of the light guide. !2A:"2Kys:
You might be curious as to why you cannot see the 3D texture property zones you ^ZhG>L*
defined. They are invisible by default, because drawing thousands of texture \h D dU+
elements can make displaying and exploring the model somewhat slow. If you *:t|qgJI#+
choose to make them visible, 3D textures are displayed in wireframe, even if the ^3{TZ=_;|
display mode is set to translucent. Wireframe rendering displays a bit faster and QP)pgAc
shows more of the technical details. L
ugn 3+
92 * LightTools Introductory Tutorial feNdMR7eM
AW_(T\P:u
HAPTER 5 Introduction to Backlight Design 65p?I g b
C &nkW1Ner9
1.Rotate and zoom the model to that you can see something like the illustration H]p!\H
below: WObvba K
. /VzI'^
2.To reveal the Property Zones: #iWSDy
a.Right-click in the Design View and select View Preferences to display this P%=#^T&`}
dialog box. l>{R`BZ/
b.On the Visibility tab, click the Property Zone check box to turn it on. :Jy'# c
c.Click OK. 4EZ9h A9+
You will see the wire frame rendering of the spherical bumps on the tqeZ#w7
bottom surface, and a solid color above it. The solid color is the 3D texture 7L@K _ZJ
of the BEFs (brightness-enhancing films) built automatically by the utility.
