The default number of bumps is 100 (10 X 10). You need to change these 97:t29N
parameters to match your design. Note that LightTools allows many other 35]j;8N:
placement options, but you will use the Bezier placement option for this KZp,=[t
example. CrRQPgl+u
5.On both the X Placement tab and Y Placement tab, change the Number of m<X#W W)N
Bumps parameter to 300, as shown in the following figure. Click Apply after -Fp!w "=T
each change. i5L+8kx4
6.Click OK to close the dialog box. 4U LJtM3
Note that the number of bumps is 300 X 300, which results in about 90,000 @1J51< x
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ZTgAZ5_cz
manner defined by the Bezier parameterization option. Please see Chapter 5 of `g4Ekp'Rp[
the LightTools Core Module User’s Guide for more information. With the 1`2);b{@
current parameter values, the Bezier option varies the bump spacing along the *<|~ =*Ddf
length of the light guide. The spacing in the orthogonal direction is constant. FthXFxwx$
The X and Y refer to the local coordinate system of the surface. R"9 oMaY
LightTools Introductory Tutorial * 91 2m)kyQ
[t "_}t =w
HAPTER 5 Introduction to Backlight Design z1{E:~f
C k@cZ"jYA
Examining Surface Properties IDiUn! 6Q
Using the methods described in previous chapters, you may want to check your U 3wsWSO
model before you run a simulation. X1
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Click on various parts of the model in the 3D Design View. Or use the System k
vue@
Navigator to select different surfaces and view their Properties. 3H\b N4
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Sug~FV?k$e
click Zones, and then click Texture. _Gs
2.Select SphericalElement, and then right-click and select Properties from the #LrCx"_&
shortcut menu. The Shape tab shows you a graphical representation of the BW;=i.
spherical bump shape that is the bottom of the light guide. pZ@W6}
You might be curious as to why you cannot see the 3D texture property zones you l?yZtZ8
defined. They are invisible by default, because drawing thousands of texture VAF:Z
elements can make displaying and exploring the model somewhat slow. If you fRv
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choose to make them visible, 3D textures are displayed in wireframe, even if the H(5ui`' s
display mode is set to translucent. Wireframe rendering displays a bit faster and @=M Z6q
shows more of the technical details. WW8YB"
92 * LightTools Introductory Tutorial Gg3?2h"d
&Gy'AUz-
HAPTER 5 Introduction to Backlight Design FgHB1x4;
C p)[ BB6E
1.Rotate and zoom the model to that you can see something like the illustration /RX k[m-
below: 0N3tsIm>
. L[QI 5N
2.To reveal the Property Zones: 56O<CgJF<
a.Right-click in the Design View and select View Preferences to display this LfjS[
dialog box. hNR >Hy\
b.On the Visibility tab, click the Property Zone check box to turn it on. 1= o(sIeA
c.Click OK. 2U+z~
You will see the wire frame rendering of the spherical bumps on the c @ZkX]g
bottom surface, and a solid color above it. The solid color is the 3D texture =aCIaL&9Y
of the BEFs (brightness-enhancing films) built automatically by the utility.
