The default number of bumps is 100 (10 X 10). You need to change these g{ P%s' %*
parameters to match your design. Note that LightTools allows many other Y}vr>\
placement options, but you will use the Bezier placement option for this m,t|IgDh
example. !0dNQ[$82
5.On both the X Placement tab and Y Placement tab, change the Number of bcZf>:gVf
Bumps parameter to 300, as shown in the following figure. Click Apply after /-i !; !
each change. zrU{@z$l
6.Click OK to close the dialog box. d`(@_czdF
Note that the number of bumps is 300 X 300, which results in about 90,000 2^^=iU=!<|
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a (k|_ J42[
manner defined by the Bezier parameterization option. Please see Chapter 5 of <En gi !
the LightTools Core Module User’s Guide for more information. With the % zO h
current parameter values, the Bezier option varies the bump spacing along the bN3#{l-`
length of the light guide. The spacing in the orthogonal direction is constant. nw6+.pOy
The X and Y refer to the local coordinate system of the surface. S*sT] J`!
LightTools Introductory Tutorial * 91
J;prC
Uk,g JR
HAPTER 5 Introduction to Backlight Design %DQhM ,c@
C D91e\|]
Examining Surface Properties P06R JE
Using the methods described in previous chapters, you may want to check your H`geS
model before you run a simulation. rgOfNVyJG<
Click on various parts of the model in the 3D Design View. Or use the System %H+\>raLz
Navigator to select different surfaces and view their Properties. - > J_ ~
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Ii:>xuF&
click Zones, and then click Texture. np 4+"
2.Select SphericalElement, and then right-click and select Properties from the UYz0PSV=.
shortcut menu. The Shape tab shows you a graphical representation of the #-GJ&m8
spherical bump shape that is the bottom of the light guide. x1BobhU~Zl
You might be curious as to why you cannot see the 3D texture property zones you M G?0>^F
defined. They are invisible by default, because drawing thousands of texture R d>B0;4
elements can make displaying and exploring the model somewhat slow. If you yA3wtm/?
choose to make them visible, 3D textures are displayed in wireframe, even if the R9! Uo
display mode is set to translucent. Wireframe rendering displays a bit faster and hbc uK&
shows more of the technical details. E!O\87[
92 * LightTools Introductory Tutorial yu;SH[{Wi
G\a8B#hg
HAPTER 5 Introduction to Backlight Design 2mq$H_
C h?$T!D>
1.Rotate and zoom the model to that you can see something like the illustration XB[<;*Iz
below: E.iSWAJ(w
. mP(kcMT "
2.To reveal the Property Zones: Z'k|u4ZC
a.Right-click in the Design View and select View Preferences to display this U bY EEY#
dialog box. -uH#VP{0M
b.On the Visibility tab, click the Property Zone check box to turn it on. 8+Td-\IMk
c.Click OK. d
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You will see the wire frame rendering of the spherical bumps on the \))=gu)I
bottom surface, and a solid color above it. The solid color is the 3D texture Ia'ZV7'
of the BEFs (brightness-enhancing films) built automatically by the utility.
