The default number of bumps is 100 (10 X 10). You need to change these U$yy 7}g
parameters to match your design. Note that LightTools allows many other mT:NC'b<9
placement options, but you will use the Bezier placement option for this H;nEU@>"Z
example. fj|b;8_}l
5.On both the X Placement tab and Y Placement tab, change the Number of M*!WXQlud
Bumps parameter to 300, as shown in the following figure. Click Apply after @An}
each change. }y %c.
6.Click OK to close the dialog box. BLN|QaZ
Note that the number of bumps is 300 X 300, which results in about 90,000 Y~ xo=v(
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a *b '4>U
manner defined by the Bezier parameterization option. Please see Chapter 5 of Um}f7^fp^l
the LightTools Core Module User’s Guide for more information. With the /KL krW
current parameter values, the Bezier option varies the bump spacing along the p}oGhO&=
length of the light guide. The spacing in the orthogonal direction is constant. 3v@h&7<E
The X and Y refer to the local coordinate system of the surface. 0iYo&q'n
LightTools Introductory Tutorial * 91 lZAXDxhnT
Rh} }8 sv
HAPTER 5 Introduction to Backlight Design 0~~yYo&
C Rk,'ujc
Examining Surface Properties 2HUw^ *3
Using the methods described in previous chapters, you may want to check your Ul_ 5"3ze
model before you run a simulation. (xfh 9=.
Click on various parts of the model in the 3D Design View. Or use the System ,,SV@y;
Navigator to select different surfaces and view their Properties. V408u y-M
1.In the System Navigator, click to open BottomSurface of the LightGuide, then [
*Dj7z t:
click Zones, and then click Texture. #f [} a
2.Select SphericalElement, and then right-click and select Properties from the @U3:9~Q
shortcut menu. The Shape tab shows you a graphical representation of the ph}%Ay$
spherical bump shape that is the bottom of the light guide. 78 w
You might be curious as to why you cannot see the 3D texture property zones you dz?On\66
defined. They are invisible by default, because drawing thousands of texture ~-<MoCm!
elements can make displaying and exploring the model somewhat slow. If you S Rtw
choose to make them visible, 3D textures are displayed in wireframe, even if the `Of D^Q=
display mode is set to translucent. Wireframe rendering displays a bit faster and 0 N"N$f
shows more of the technical details. 0SfW:3
92 * LightTools Introductory Tutorial /GVjesN
PB
*v45
HAPTER 5 Introduction to Backlight Design X% )~i[_DV
C ^,0Lr$+
1.Rotate and zoom the model to that you can see something like the illustration =z;]FauR!
below: Vm8@ LA
. CT5s`v!s
2.To reveal the Property Zones: oYdE s&qq
a.Right-click in the Design View and select View Preferences to display this 4Q/{l qG
dialog box. _p>F43%p
b.On the Visibility tab, click the Property Zone check box to turn it on. IU<lF) PF$
c.Click OK. )Gavjj&uJ
You will see the wire frame rendering of the spherical bumps on the :hT.L3n,
bottom surface, and a solid color above it. The solid color is the 3D texture J /fnSy
of the BEFs (brightness-enhancing films) built automatically by the utility.
