The default number of bumps is 100 (10 X 10). You need to change these a@WSIcX*W
parameters to match your design. Note that LightTools allows many other KbF,jm 5
placement options, but you will use the Bezier placement option for this : ~]ha
example. yn5yQ;
5.On both the X Placement tab and Y Placement tab, change the Number of 4qEeN-6h
Bumps parameter to 300, as shown in the following figure. Click Apply after )0Lv- Gs
each change. VFwp .1oa!
6.Click OK to close the dialog box. f qU*y 6]
Note that the number of bumps is 300 X 300, which results in about 90,000 Ke+ #ww
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a CVBy& o"6A
manner defined by the Bezier parameterization option. Please see Chapter 5 of {oN7I' >
the LightTools Core Module User’s Guide for more information. With the -^LEGKN
current parameter values, the Bezier option varies the bump spacing along the Y)4&PN~[
length of the light guide. The spacing in the orthogonal direction is constant. w873: =
The X and Y refer to the local coordinate system of the surface. =h 2zIcj
LightTools Introductory Tutorial * 91 !pLQRnI}6
ZMXIKN9BF#
HAPTER 5 Introduction to Backlight Design h"G#} C]
C 3 a G?^z
Examining Surface Properties Gv w:h9v
Using the methods described in previous chapters, you may want to check your $u./%JS
model before you run a simulation. E7qk>~Dg
Click on various parts of the model in the 3D Design View. Or use the System cUz7F
Navigator to select different surfaces and view their Properties. <ibEo98
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Mrlv(1PQT
click Zones, and then click Texture. k:0HsN!F9
2.Select SphericalElement, and then right-click and select Properties from the Cuq=>J
shortcut menu. The Shape tab shows you a graphical representation of the Y_49Ut JIg
spherical bump shape that is the bottom of the light guide. @t6B\ ?4'T
You might be curious as to why you cannot see the 3D texture property zones you ^SKuX?f\
defined. They are invisible by default, because drawing thousands of texture =F5(k(Ds
elements can make displaying and exploring the model somewhat slow. If you (r?41?5K
choose to make them visible, 3D textures are displayed in wireframe, even if the Fh4kd>1 D
display mode is set to translucent. Wireframe rendering displays a bit faster and s`G3SE
shows more of the technical details. |Tp>,\:5
92 * LightTools Introductory Tutorial G-]ndrTn
.* xaI+:
HAPTER 5 Introduction to Backlight Design B V X6
C -* u7MF q_
1.Rotate and zoom the model to that you can see something like the illustration U1t 7XZ3e
below: 0;j)rmt
. /8i3 I5*
2.To reveal the Property Zones: x 2\ ,n
a.Right-click in the Design View and select View Preferences to display this hX~d1.]Y
dialog box. x_vaYUl)
b.On the Visibility tab, click the Property Zone check box to turn it on. -Fe) )Y'=
c.Click OK. I=)u:l c
You will see the wire frame rendering of the spherical bumps on the rn7eY
bottom surface, and a solid color above it. The solid color is the 3D texture [;/ydE=
of the BEFs (brightness-enhancing films) built automatically by the utility.
