The default number of bumps is 100 (10 X 10). You need to change these U $ bLt
parameters to match your design. Note that LightTools allows many other VIi/ =mO]
placement options, but you will use the Bezier placement option for this yN Bb(!u
example. ?g5u#Q> !
5.On both the X Placement tab and Y Placement tab, change the Number of t'F_1P^*/
Bumps parameter to 300, as shown in the following figure. Click Apply after -1>$3-ur~
each change. KJf~9w9U
6.Click OK to close the dialog box. nU6WT |
Note that the number of bumps is 300 X 300, which results in about 90,000 .vbUv3NI
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 1 =cFV'
manner defined by the Bezier parameterization option. Please see Chapter 5 of )Fo1[:_B '
the LightTools Core Module User’s Guide for more information. With the !83N.
gN
current parameter values, the Bezier option varies the bump spacing along the I}@m6D|\
length of the light guide. The spacing in the orthogonal direction is constant. o9Z!Z ^
The X and Y refer to the local coordinate system of the surface. \~YyY'J
LightTools Introductory Tutorial * 91 @fVCGV?'
.L X8ko
HAPTER 5 Introduction to Backlight Design hR] AUH
C ^6S td
x_
Examining Surface Properties ]q2g[D o5
Using the methods described in previous chapters, you may want to check your J6) &b7
model before you run a simulation. A>c/q&WUk
Click on various parts of the model in the 3D Design View. Or use the System N]k(8K
Navigator to select different surfaces and view their Properties. #78P_{ #!
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ppBIl6
click Zones, and then click Texture. : cmQ
w
2.Select SphericalElement, and then right-click and select Properties from the d/Z258
shortcut menu. The Shape tab shows you a graphical representation of the 2[*r9%W
spherical bump shape that is the bottom of the light guide. \3ZQ:E}5
You might be curious as to why you cannot see the 3D texture property zones you LD~s@}yH>
defined. They are invisible by default, because drawing thousands of texture aC&ZV}8of
elements can make displaying and exploring the model somewhat slow. If you -C7IUat<
choose to make them visible, 3D textures are displayed in wireframe, even if the P0E n&g+~
display mode is set to translucent. Wireframe rendering displays a bit faster and ?rD`'B
shows more of the technical details. 6# JdQ[IP6
92 * LightTools Introductory Tutorial {c3u!} mW
QqC4g]
HAPTER 5 Introduction to Backlight Design DM-8azq $
C 7sQw&yUL)
1.Rotate and zoom the model to that you can see something like the illustration % 1+\N
below: XQ{G )
. nVTCbV
2.To reveal the Property Zones: _V9 O,"DDc
a.Right-click in the Design View and select View Preferences to display this G2nL#l~@)
dialog box. qX GAlCq@
b.On the Visibility tab, click the Property Zone check box to turn it on. 9 pGND]tIi
c.Click OK. O>E2G]K]\
You will see the wire frame rendering of the spherical bumps on the 9P 3jx)K
bottom surface, and a solid color above it. The solid color is the 3D texture "\'g2|A
of the BEFs (brightness-enhancing films) built automatically by the utility.
