The default number of bumps is 100 (10 X 10). You need to change these $k(9 U\y-
parameters to match your design. Note that LightTools allows many other pa]
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placement options, but you will use the Bezier placement option for this HRRngk#lV
example. \3 KfD'L
5.On both the X Placement tab and Y Placement tab, change the Number of "<dN9l>
Bumps parameter to 300, as shown in the following figure. Click Apply after F|]rA*2u
each change. -g2{68 1`r
6.Click OK to close the dialog box. 6IF|3@yD
Note that the number of bumps is 300 X 300, which results in about 90,000 ._BB+G
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Rk[8Bd?
manner defined by the Bezier parameterization option. Please see Chapter 5 of iy
3DX|]
the LightTools Core Module User’s Guide for more information. With the 0e9A+&r
current parameter values, the Bezier option varies the bump spacing along the T^.{9F]*S
length of the light guide. The spacing in the orthogonal direction is constant. Z)v)\l9d
The X and Y refer to the local coordinate system of the surface. O&P >x#w
LightTools Introductory Tutorial * 91 >DmRP7v
)n7)}xy#z
HAPTER 5 Introduction to Backlight Design cJ4S!
C er\:U0fr#@
Examining Surface Properties xhD$e=
g
Using the methods described in previous chapters, you may want to check your `1p?*9Ssn
model before you run a simulation. xucIjPi]
Click on various parts of the model in the 3D Design View. Or use the System H5 ^Y->
Navigator to select different surfaces and view their Properties. v =bv@c
1.In the System Navigator, click to open BottomSurface of the LightGuide, then bG1 of sU
click Zones, and then click Texture. ;G $)MS'nB
2.Select SphericalElement, and then right-click and select Properties from the vcD'~)G(*
shortcut menu. The Shape tab shows you a graphical representation of the &1$8q0
spherical bump shape that is the bottom of the light guide. AuM:2N2
You might be curious as to why you cannot see the 3D texture property zones you '!j(u@&!
defined. They are invisible by default, because drawing thousands of texture { ;' :h
elements can make displaying and exploring the model somewhat slow. If you EreAn
choose to make them visible, 3D textures are displayed in wireframe, even if the 7#/|VQX<A
display mode is set to translucent. Wireframe rendering displays a bit faster and p gfu+K7?w
shows more of the technical details. = tP$re";o
92 * LightTools Introductory Tutorial Bzm. X=U :
Lj-{t% }
HAPTER 5 Introduction to Backlight Design ~ )!VV)
C 6 cr^<]v !
1.Rotate and zoom the model to that you can see something like the illustration VG#$fRrZ
below: |<2JQ []
. ^8U6"O6|X
2.To reveal the Property Zones: [@s= J)H
a.Right-click in the Design View and select View Preferences to display this J4&XPr9
dialog box. m>+A*M8
b.On the Visibility tab, click the Property Zone check box to turn it on. Fj48quW1\P
c.Click OK. _/8y1) I
You will see the wire frame rendering of the spherical bumps on the zh
hGqz[K
bottom surface, and a solid color above it. The solid color is the 3D texture 2tlO"c:_/
of the BEFs (brightness-enhancing films) built automatically by the utility.
