The default number of bumps is 100 (10 X 10). You need to change these {gT2G*Ed^Z
parameters to match your design. Note that LightTools allows many other Z+! ._uA
placement options, but you will use the Bezier placement option for this zRSIJ!A~
example. wiKUs0 |
5.On both the X Placement tab and Y Placement tab, change the Number of ^}vL ZA
Bumps parameter to 300, as shown in the following figure. Click Apply after $a|C/s+}7>
each change. mcvd/
6.Click OK to close the dialog box. f mu `o-
Note that the number of bumps is 300 X 300, which results in about 90,000 T|RW- i3
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a q ^ N I
manner defined by the Bezier parameterization option. Please see Chapter 5 of BM9J/24
the LightTools Core Module User’s Guide for more information. With the zXWf($^&E
current parameter values, the Bezier option varies the bump spacing along the .21[3.bp/q
length of the light guide. The spacing in the orthogonal direction is constant. %2>ya>/M
The X and Y refer to the local coordinate system of the surface. &Jw]3U5J
LightTools Introductory Tutorial * 91 8L] em&871
32j@6!
HAPTER 5 Introduction to Backlight Design w ryjs!
C Y~@@{zP
Examining Surface Properties ?Ho~6q8O@
Using the methods described in previous chapters, you may want to check your r/E'#5 Q
model before you run a simulation. O]&DDzo
Click on various parts of the model in the 3D Design View. Or use the System Plpt7Pa_
Navigator to select different surfaces and view their Properties. B=?4; l7
1.In the System Navigator, click to open BottomSurface of the LightGuide, then VA{2a7]
click Zones, and then click Texture. T v2d?y
2.Select SphericalElement, and then right-click and select Properties from the }Fy~DsQ
shortcut menu. The Shape tab shows you a graphical representation of the +
q@kRQY;n
spherical bump shape that is the bottom of the light guide. %6c[\ubr
You might be curious as to why you cannot see the 3D texture property zones you 9,8}4Y=GVI
defined. They are invisible by default, because drawing thousands of texture X;`Xk Ojk
elements can make displaying and exploring the model somewhat slow. If you $]O;D~
choose to make them visible, 3D textures are displayed in wireframe, even if the :Z rE/3_S
display mode is set to translucent. Wireframe rendering displays a bit faster and AY3nQH
shows more of the technical details. -:Up$6PR
92 * LightTools Introductory Tutorial Ps=OL\i
t0t" =(d
HAPTER 5 Introduction to Backlight Design a?&{eMEe}
C .[YM0dt
1.Rotate and zoom the model to that you can see something like the illustration 5`] ;[M9
below: -UD^O*U
. ipy 1tXc
2.To reveal the Property Zones: n
*Y+y
a.Right-click in the Design View and select View Preferences to display this `x%(
n@ g
dialog box. s az<NT
b.On the Visibility tab, click the Property Zone check box to turn it on. ]!l]^/ .
c.Click OK. 0Bbno9Yp
You will see the wire frame rendering of the spherical bumps on the w#ha ^4
bottom surface, and a solid color above it. The solid color is the 3D texture 9cV;W \ Tw
of the BEFs (brightness-enhancing films) built automatically by the utility.
