The default number of bumps is 100 (10 X 10). You need to change these gq~"Z[T
parameters to match your design. Note that LightTools allows many other Nwk^r75l q
placement options, but you will use the Bezier placement option for this \og2\Oh&gH
example. 8qoA5fW>
5.On both the X Placement tab and Y Placement tab, change the Number of 877Kv);
Bumps parameter to 300, as shown in the following figure. Click Apply after T/jxsIt3
each change. I^G6aw
6.Click OK to close the dialog box. %I@ vM s^
Note that the number of bumps is 300 X 300, which results in about 90,000 ul!q)cPb{
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a \ !IEZ
manner defined by the Bezier parameterization option. Please see Chapter 5 of o 80x@ &A:
the LightTools Core Module User’s Guide for more information. With the -0<ZN(?|
current parameter values, the Bezier option varies the bump spacing along the xsU3c0wbr8
length of the light guide. The spacing in the orthogonal direction is constant. N3w y][bo
The X and Y refer to the local coordinate system of the surface. x\YVB',h
LightTools Introductory Tutorial * 91 ^grDP*;W
2%) ~E50U
HAPTER 5 Introduction to Backlight Design @[ {5{ y
C Y[ W] YPs
Examining Surface Properties :c(#03w*C
Using the methods described in previous chapters, you may want to check your fr&p0)85>B
model before you run a simulation. h7 AO5"6
Click on various parts of the model in the 3D Design View. Or use the System A:5P
Navigator to select different surfaces and view their Properties. 3V<c4'O\W
1.In the System Navigator, click to open BottomSurface of the LightGuide, then h;~NA}>
click Zones, and then click Texture. D[{"]=-
2.Select SphericalElement, and then right-click and select Properties from the $_gv(&ZT
shortcut menu. The Shape tab shows you a graphical representation of the 7?\r9b D
spherical bump shape that is the bottom of the light guide. x! u6LDq0
You might be curious as to why you cannot see the 3D texture property zones you i*mI-l
defined. They are invisible by default, because drawing thousands of texture L+0:'p=
elements can make displaying and exploring the model somewhat slow. If you |7!B k$(vA
choose to make them visible, 3D textures are displayed in wireframe, even if the =>7czw:S 1
display mode is set to translucent. Wireframe rendering displays a bit faster and . `oKd@I*"
shows more of the technical details. TV}=$\D
92 * LightTools Introductory Tutorial Sp]ov:]%f
::@ JL
HAPTER 5 Introduction to Backlight Design #z}0]GJKj
C !e('T@^u6u
1.Rotate and zoom the model to that you can see something like the illustration /9| 2uw`
below: AG"iS<u
. IEWl
I
2.To reveal the Property Zones: Zt
1nH
a.Right-click in the Design View and select View Preferences to display this | I3&a=,
dialog box. ^BP4l_rO9
b.On the Visibility tab, click the Property Zone check box to turn it on. ]PbwG
c.Click OK. }xY|z"&
You will see the wire frame rendering of the spherical bumps on the &?k`rF9
bottom surface, and a solid color above it. The solid color is the 3D texture 6` 3kNk;
of the BEFs (brightness-enhancing films) built automatically by the utility.
