The default number of bumps is 100 (10 X 10). You need to change these 8}Fw%;Cb
parameters to match your design. Note that LightTools allows many other ~JIywzcf8
placement options, but you will use the Bezier placement option for this |~7+/VvI+
example. ?T tQZ
5.On both the X Placement tab and Y Placement tab, change the Number of 3| GNi~
Bumps parameter to 300, as shown in the following figure. Click Apply after [c,|Lw4
each change. .`:oP&9r
6.Click OK to close the dialog box. # FrwfJOV
Note that the number of bumps is 300 X 300, which results in about 90,000 5cPSv?x^F@
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 3WQ RN_
manner defined by the Bezier parameterization option. Please see Chapter 5 of ,R7=]~<io"
the LightTools Core Module User’s Guide for more information. With the f6keWqv<GW
current parameter values, the Bezier option varies the bump spacing along the Y{+zg9L*
length of the light guide. The spacing in the orthogonal direction is constant. =>gyc;{2K<
The X and Y refer to the local coordinate system of the surface. !%SdTaC{T
LightTools Introductory Tutorial * 91 yg]suU<z]
Oz"@yL}
HAPTER 5 Introduction to Backlight Design W@R$' r,@O
C eD>-`'7 <
Examining Surface Properties <1;,B%_^
Using the methods described in previous chapters, you may want to check your ls8olLM>
model before you run a simulation. RTdD]pE8Q
Click on various parts of the model in the 3D Design View. Or use the System `I]1l MJ)o
Navigator to select different surfaces and view their Properties. AAIyr703cQ
1.In the System Navigator, click to open BottomSurface of the LightGuide, then /vFxVBX
click Zones, and then click Texture. <~IH`
2.Select SphericalElement, and then right-click and select Properties from the !=8L. ^5c
shortcut menu. The Shape tab shows you a graphical representation of the Co{MIuL
spherical bump shape that is the bottom of the light guide. x!Z:K5%O
You might be curious as to why you cannot see the 3D texture property zones you qat45O4A1
defined. They are invisible by default, because drawing thousands of texture 9} K(Q=
elements can make displaying and exploring the model somewhat slow. If you # u}v7{4
choose to make them visible, 3D textures are displayed in wireframe, even if the gb!@OZ c
display mode is set to translucent. Wireframe rendering displays a bit faster and l%-67(
shows more of the technical details. .FfwY 'V
92 * LightTools Introductory Tutorial =)"N E>
&0;{lS[N:L
HAPTER 5 Introduction to Backlight Design #+ 2:d?t
C rf1wS*uU+
1.Rotate and zoom the model to that you can see something like the illustration pq/ FLYiv
below: bc0)'a\
. |!jYv'%
2.To reveal the Property Zones: ZNL;8sI?>
a.Right-click in the Design View and select View Preferences to display this 3iwoMrp
dialog box. #cSw"A
b.On the Visibility tab, click the Property Zone check box to turn it on. <3],C) Zwc
c.Click OK. AAlmG9l &7
You will see the wire frame rendering of the spherical bumps on the Ee$" O 6*!
bottom surface, and a solid color above it. The solid color is the 3D texture fl5UY$a2-
of the BEFs (brightness-enhancing films) built automatically by the utility.
