The default number of bumps is 100 (10 X 10). You need to change these z)L}ECZh9
parameters to match your design. Note that LightTools allows many other jD< pIHau
placement options, but you will use the Bezier placement option for this ~5#)N{GbY
example. 9fVj
8G
5.On both the X Placement tab and Y Placement tab, change the Number of } ~enEZ
Bumps parameter to 300, as shown in the following figure. Click Apply after oFg'wAO.
each change. . 5hp0L}
6.Click OK to close the dialog box. Wpm9`K
Note that the number of bumps is 300 X 300, which results in about 90,000 c]m! G'L_/
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a (ppoW
manner defined by the Bezier parameterization option. Please see Chapter 5 of 2)LX^?7R
the LightTools Core Module User’s Guide for more information. With the Q9y*:
current parameter values, the Bezier option varies the bump spacing along the @5Q oi~o
length of the light guide. The spacing in the orthogonal direction is constant. w6,*9(;$Pk
The X and Y refer to the local coordinate system of the surface. B \<ydN
LightTools Introductory Tutorial * 91 /mbCP>bcG
1i?=J AFfM
HAPTER 5 Introduction to Backlight Design ~w.2 -D
C C-#.RI7
Examining Surface Properties ?n*fy
Using the methods described in previous chapters, you may want to check your Gp1EJ2d8
model before you run a simulation. Zq?_dIX
%
Click on various parts of the model in the 3D Design View. Or use the System Wvr+y!F
Navigator to select different surfaces and view their Properties. d(l|hmj4j9
1.In the System Navigator, click to open BottomSurface of the LightGuide, then zO2{.4
click Zones, and then click Texture. p?Sl}A@`
2.Select SphericalElement, and then right-click and select Properties from the S %+R#A1
shortcut menu. The Shape tab shows you a graphical representation of the K\sbt7 ~
spherical bump shape that is the bottom of the light guide. ~/ c5 hyTx
You might be curious as to why you cannot see the 3D texture property zones you %Dyh:h
defined. They are invisible by default, because drawing thousands of texture l P0k:
elements can make displaying and exploring the model somewhat slow. If you r{ "uv=,`
choose to make them visible, 3D textures are displayed in wireframe, even if the 46ChMTt
display mode is set to translucent. Wireframe rendering displays a bit faster and eY3=|RR
shows more of the technical details. ONWO`XD
92 * LightTools Introductory Tutorial y&rY0bm
M.k|bh8
HAPTER 5 Introduction to Backlight Design 6lU|mJ`M
C a!u3 HS -i
1.Rotate and zoom the model to that you can see something like the illustration A+2 oh3
below: )k%M.{&bji
. n0FYf qH
2.To reveal the Property Zones: B! `\L!
a.Right-click in the Design View and select View Preferences to display this <JH9StGGc?
dialog box. `@\^m_!}
b.On the Visibility tab, click the Property Zone check box to turn it on. 2?1}ZXr
c.Click OK. \\iK'|5YG
You will see the wire frame rendering of the spherical bumps on the * f* f&l %
bottom surface, and a solid color above it. The solid color is the 3D texture LhKY}R
of the BEFs (brightness-enhancing films) built automatically by the utility.
