The default number of bumps is 100 (10 X 10). You need to change these CUHT5J*sY
parameters to match your design. Note that LightTools allows many other Yg,;l-1
placement options, but you will use the Bezier placement option for this ~A1! !rJX
example. 6B%
h
5.On both the X Placement tab and Y Placement tab, change the Number of ky-nP8 L}
Bumps parameter to 300, as shown in the following figure. Click Apply after 5KDCm w
each change. fUGappb
6.Click OK to close the dialog box. 0\vG
<
Note that the number of bumps is 300 X 300, which results in about 90,000 0AdxV?6z
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a GKjtX?~1
manner defined by the Bezier parameterization option. Please see Chapter 5 of 6Ol9P56j
the LightTools Core Module User’s Guide for more information. With the JT!9LNh;R`
current parameter values, the Bezier option varies the bump spacing along the 8 ]exsn Z
length of the light guide. The spacing in the orthogonal direction is constant. 3Pllxq<n
The X and Y refer to the local coordinate system of the surface. 5&h">_j
LightTools Introductory Tutorial * 91 (L i0*wRb
fm`V 2'Rm
HAPTER 5 Introduction to Backlight Design qTN%9!0@9
C qv}ECQ
Examining Surface Properties \gB ~0@[\7
Using the methods described in previous chapters, you may want to check your oP9 y@U
model before you run a simulation. dq`{fqGl
Click on various parts of the model in the 3D Design View. Or use the System |q 8N$m
Navigator to select different surfaces and view their Properties. zA8@'`Id
1.In the System Navigator, click to open BottomSurface of the LightGuide, then -B9e&J
{K
click Zones, and then click Texture. K5|~iW'
2.Select SphericalElement, and then right-click and select Properties from the )XGz#C_P
shortcut menu. The Shape tab shows you a graphical representation of the /PeT4hW}
spherical bump shape that is the bottom of the light guide. =*j Faj
You might be curious as to why you cannot see the 3D texture property zones you # {{p4/:
defined. They are invisible by default, because drawing thousands of texture zL9~gJ
elements can make displaying and exploring the model somewhat slow. If you mJ=V <_
choose to make them visible, 3D textures are displayed in wireframe, even if the o5
fV,BJZO
display mode is set to translucent. Wireframe rendering displays a bit faster and mO]>]
shows more of the technical details. j6Sg~nRh
92 * LightTools Introductory Tutorial e,VF;Br
5h`L W A B
HAPTER 5 Introduction to Backlight Design @+H 0D"
C 83SK<V6
1.Rotate and zoom the model to that you can see something like the illustration E:ci/09wD
below: L!zd rCM
. l>b'b e 9
2.To reveal the Property Zones: %),u0:go
a.Right-click in the Design View and select View Preferences to display this Vub6wb<G[
dialog box.
9\< q =p~
b.On the Visibility tab, click the Property Zone check box to turn it on. }O>1tauI
c.Click OK. <j>;5!4!}
You will see the wire frame rendering of the spherical bumps on the &
]] l0B
bottom surface, and a solid color above it. The solid color is the 3D texture P1T {5u!T
of the BEFs (brightness-enhancing films) built automatically by the utility.
