The default number of bumps is 100 (10 X 10). You need to change these ?l
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parameters to match your design. Note that LightTools allows many other S.fb[gI]
placement options, but you will use the Bezier placement option for this erV&N,cI
example. \D ! I "mr
5.On both the X Placement tab and Y Placement tab, change the Number of 1Dm$:),^T}
Bumps parameter to 300, as shown in the following figure. Click Apply after I"jub
kI=Z
each change. Wc/B_F?2
6.Click OK to close the dialog box. I \6^]pi,
Note that the number of bumps is 300 X 300, which results in about 90,000 ;uU 8$
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 38RyUHL=
manner defined by the Bezier parameterization option. Please see Chapter 5 of XCO ;t_ %
the LightTools Core Module User’s Guide for more information. With the VC NQ}h[D
current parameter values, the Bezier option varies the bump spacing along the
&Mh]s\
length of the light guide. The spacing in the orthogonal direction is constant. p:4oA<V
The X and Y refer to the local coordinate system of the surface. `[4{]jX+<
LightTools Introductory Tutorial * 91 T!H }^v
s9?H#^Y5u
HAPTER 5 Introduction to Backlight Design eOd'i{f@F
C Ar$ Am
Examining Surface Properties u,Cf4H*xS
Using the methods described in previous chapters, you may want to check your OmECvL'Z
model before you run a simulation. l9$"zEC
Click on various parts of the model in the 3D Design View. Or use the System L q;=UE
Navigator to select different surfaces and view their Properties. iC<qWq|S_m
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ~w$ ^`e!]
click Zones, and then click Texture. gs= (h *
2.Select SphericalElement, and then right-click and select Properties from the wb-_CQ
shortcut menu. The Shape tab shows you a graphical representation of the 0a's[ >-'A
spherical bump shape that is the bottom of the light guide. nA#dXckoc
You might be curious as to why you cannot see the 3D texture property zones you $C&E3 'O
defined. They are invisible by default, because drawing thousands of texture EYKV}`
elements can make displaying and exploring the model somewhat slow. If you y)+l U
choose to make them visible, 3D textures are displayed in wireframe, even if the HS
1zA
display mode is set to translucent. Wireframe rendering displays a bit faster and >VvA &p71b
shows more of the technical details. \w@ "`!%
92 * LightTools Introductory Tutorial @avG*Mr^
IaR D"oCH
HAPTER 5 Introduction to Backlight Design #; >v,Jo
C p+1kU1F 0
1.Rotate and zoom the model to that you can see something like the illustration .|3& lb6
below: ft 4(^|~
. kt hy9<!$
2.To reveal the Property Zones: A>J,Bi
a.Right-click in the Design View and select View Preferences to display this (wZ/I( 4
dialog box. [-JU(:Rh
b.On the Visibility tab, click the Property Zone check box to turn it on. $2pkh%
c.Click OK. hx uc4C\J
You will see the wire frame rendering of the spherical bumps on the _{YUWV50}
bottom surface, and a solid color above it. The solid color is the 3D texture : ]~G9]R`
of the BEFs (brightness-enhancing films) built automatically by the utility.
