The default number of bumps is 100 (10 X 10). You need to change these 1024L;
parameters to match your design. Note that LightTools allows many other qWJHb Dd
placement options, but you will use the Bezier placement option for this MT6" b
example. nl~ Z,Y$
5.On both the X Placement tab and Y Placement tab, change the Number of R_b4S%jhx
Bumps parameter to 300, as shown in the following figure. Click Apply after <[K3Prf C
each change. Bru] ;%Qg%
6.Click OK to close the dialog box. `g <0FQA
Note that the number of bumps is 300 X 300, which results in about 90,000 Mh
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bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a WF:4p]0~)
manner defined by the Bezier parameterization option. Please see Chapter 5 of \/b[V3<"
the LightTools Core Module User’s Guide for more information. With the ]Ljb&*IEj
current parameter values, the Bezier option varies the bump spacing along the bu -6}T+
length of the light guide. The spacing in the orthogonal direction is constant. ;*0nPhBw0>
The X and Y refer to the local coordinate system of the surface. eAStpG" *
LightTools Introductory Tutorial * 91 Tv6y +l
sOb]o[=
HAPTER 5 Introduction to Backlight Design YRMe<upo
C ?Qx4Z3n
Examining Surface Properties 56 Z
Using the methods described in previous chapters, you may want to check your 7 IJn9 b
model before you run a simulation. : ^U>n{
Click on various parts of the model in the 3D Design View. Or use the System w@Asz9Lq%
Navigator to select different surfaces and view their Properties. p:W{c/tV
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Fv$A %6;W
click Zones, and then click Texture. q oZ)"M
2.Select SphericalElement, and then right-click and select Properties from the 5{#s<%b.
shortcut menu. The Shape tab shows you a graphical representation of the T+B8SZw#}!
spherical bump shape that is the bottom of the light guide. /;{L~f=et)
You might be curious as to why you cannot see the 3D texture property zones you u-tD_UIck
defined. They are invisible by default, because drawing thousands of texture 5=I"bnIU
elements can make displaying and exploring the model somewhat slow. If you yFS{8yrRUU
choose to make them visible, 3D textures are displayed in wireframe, even if the ,SNt*t1 "
display mode is set to translucent. Wireframe rendering displays a bit faster and 78r0K 5=
shows more of the technical details. __zHe-.m
92 * LightTools Introductory Tutorial 9 Ofls9]U
kKjcW` [
HAPTER 5 Introduction to Backlight Design 8_ o~0lb
C Q*M(d\V s
1.Rotate and zoom the model to that you can see something like the illustration /Kq'3[d8
below: c&,q`_t
. 9ggl yoZ%
2.To reveal the Property Zones: Gs,e8ri!
a.Right-click in the Design View and select View Preferences to display this f/s" 2r
dialog box. B?yj U[/R
b.On the Visibility tab, click the Property Zone check box to turn it on. M < .1U?_#
c.Click OK. z"mpw mv5
You will see the wire frame rendering of the spherical bumps on the fFYoZ/\
bottom surface, and a solid color above it. The solid color is the 3D texture C/H; |3. X
of the BEFs (brightness-enhancing films) built automatically by the utility.
