The default number of bumps is 100 (10 X 10). You need to change these T|c9Swu r
parameters to match your design. Note that LightTools allows many other > WsRCBA
placement options, but you will use the Bezier placement option for this y<<:6OBj
example. y@L-qO+{&
5.On both the X Placement tab and Y Placement tab, change the Number of
<$\En[u0
Bumps parameter to 300, as shown in the following figure. Click Apply after +cw;a]o^>
each change. JBsHr%!i
6.Click OK to close the dialog box. mu(EmAoenQ
Note that the number of bumps is 300 X 300, which results in about 90,000 t1I` n(]n
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a /
xfg4
manner defined by the Bezier parameterization option. Please see Chapter 5 of
'kD~tpZ
the LightTools Core Module User’s Guide for more information. With the AV0C9a/td
current parameter values, the Bezier option varies the bump spacing along the {cNH|
length of the light guide. The spacing in the orthogonal direction is constant. qQ_o>+3VAy
The X and Y refer to the local coordinate system of the surface. )cMW,
LightTools Introductory Tutorial * 91 _TRO2 p0
CS:mO |
HAPTER 5 Introduction to Backlight Design U se`E
C D &xb tJd
Examining Surface Properties 9\|n2$H:
Using the methods described in previous chapters, you may want to check your ?}N@bsl08w
model before you run a simulation. +N9(o+UrU
Click on various parts of the model in the 3D Design View. Or use the System QX*HvT
Navigator to select different surfaces and view their Properties. 8G>;X;W
1.In the System Navigator, click to open BottomSurface of the LightGuide, then % m hnd):
click Zones, and then click Texture. ' Vp6=,P
2.Select SphericalElement, and then right-click and select Properties from the l"\W] 'T:r
shortcut menu. The Shape tab shows you a graphical representation of the ?5%|YsJP_
spherical bump shape that is the bottom of the light guide. ?\ QEK
You might be curious as to why you cannot see the 3D texture property zones you }<EA)se"
defined. They are invisible by default, because drawing thousands of texture T4\F=iw4
elements can make displaying and exploring the model somewhat slow. If you S)@95pb
choose to make them visible, 3D textures are displayed in wireframe, even if the O1.a=O
display mode is set to translucent. Wireframe rendering displays a bit faster and S >P TD@
shows more of the technical details. uM8YY[b
92 * LightTools Introductory Tutorial {I !sXj
CaZ{UGokL
HAPTER 5 Introduction to Backlight Design 7kBULeBn|
C ldJ:A*/M6
1.Rotate and zoom the model to that you can see something like the illustration B}.G(-u?7
below: %}U-g"I
. x+}6qfc$9k
2.To reveal the Property Zones: D3LW 49
a.Right-click in the Design View and select View Preferences to display this b@OL !?JP
dialog box. }ST9&w i~
b.On the Visibility tab, click the Property Zone check box to turn it on. JNzNK.E!m-
c.Click OK. H4HWr6
You will see the wire frame rendering of the spherical bumps on the "RG.27
bottom surface, and a solid color above it. The solid color is the 3D texture acWm+
of the BEFs (brightness-enhancing films) built automatically by the utility.
