The default number of bumps is 100 (10 X 10). You need to change these b'Piymx
parameters to match your design. Note that LightTools allows many other lN= m$ J
placement options, but you will use the Bezier placement option for this nJM9c[Ou^H
example. C7c|\ T
5.On both the X Placement tab and Y Placement tab, change the Number of \V!X& a
Bumps parameter to 300, as shown in the following figure. Click Apply after ??esB& 4?
each change. ]'bQ(<^#
6.Click OK to close the dialog box. {TcbCjy w
Note that the number of bumps is 300 X 300, which results in about 90,000 { XVf|zM,
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a
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manner defined by the Bezier parameterization option. Please see Chapter 5 of I,`D&
the LightTools Core Module User’s Guide for more information. With the C6;](rN)N
current parameter values, the Bezier option varies the bump spacing along the X=!n,=xI
length of the light guide. The spacing in the orthogonal direction is constant. S:B- nI
The X and Y refer to the local coordinate system of the surface. 9< 0$mE^:
LightTools Introductory Tutorial * 91 A= YEY n
Vg C9' "|
HAPTER 5 Introduction to Backlight Design u q#h\p|
C Q e2 /4j4
Examining Surface Properties ?'8MI|*l%
Using the methods described in previous chapters, you may want to check your \qK}(xq[
model before you run a simulation. vSHIl"h
Click on various parts of the model in the 3D Design View. Or use the System Nf?,
_Rl
Navigator to select different surfaces and view their Properties. #uR q] 'P
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 6jy n,GU
click Zones, and then click Texture. oJz:uv8Pe.
2.Select SphericalElement, and then right-click and select Properties from the `QyALcO
shortcut menu. The Shape tab shows you a graphical representation of the =QxE -)v
spherical bump shape that is the bottom of the light guide. ] l qFht
You might be curious as to why you cannot see the 3D texture property zones you RWm Q]
defined. They are invisible by default, because drawing thousands of texture '%|20 j
elements can make displaying and exploring the model somewhat slow. If you yZPFo
choose to make them visible, 3D textures are displayed in wireframe, even if the dxhjPS~^Q
display mode is set to translucent. Wireframe rendering displays a bit faster and ~D-OL* 2
shows more of the technical details. uD* s^
92 * LightTools Introductory Tutorial 3lrZ-k+S{
k;Ny%%5
HAPTER 5 Introduction to Backlight Design Q!A3hr$IF
C p(b1I+!
1.Rotate and zoom the model to that you can see something like the illustration !6 fpMo
below: c%,6L <[
. HZQ3Ht 3Vh
2.To reveal the Property Zones: zZjLt1
a.Right-click in the Design View and select View Preferences to display this JgjL$n; F
dialog box. OB
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b.On the Visibility tab, click the Property Zone check box to turn it on. sZP3xh[B
c.Click OK. >*Z{@1*h
You will see the wire frame rendering of the spherical bumps on the )k%drdY{J'
bottom surface, and a solid color above it. The solid color is the 3D texture uJ5%JB("E
of the BEFs (brightness-enhancing films) built automatically by the utility.
