The default number of bumps is 100 (10 X 10). You need to change these 7gQt
k
parameters to match your design. Note that LightTools allows many other *;gi52tM
placement options, but you will use the Bezier placement option for this -;~_]t^a
example. ~Q%QA._R?
5.On both the X Placement tab and Y Placement tab, change the Number of q0c)pxD%`
Bumps parameter to 300, as shown in the following figure. Click Apply after ~{NDtB)
each change. xq~=T:>/A
6.Click OK to close the dialog box. / TJTu_#
Note that the number of bumps is 300 X 300, which results in about 90,000 W}=2?vHV=
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Sr+1.77}
manner defined by the Bezier parameterization option. Please see Chapter 5 of 6kDU}]c:H]
the LightTools Core Module User’s Guide for more information. With the \uPT-M*
current parameter values, the Bezier option varies the bump spacing along the *@BBlkcx
length of the light guide. The spacing in the orthogonal direction is constant. fV5#k@,")
The X and Y refer to the local coordinate system of the surface. QiRzA4-zq
LightTools Introductory Tutorial * 91 d,0pNav)
1^W Aps
HAPTER 5 Introduction to Backlight Design 3<`h /`ku
C ]g)%yuox9F
Examining Surface Properties (6A{6_p
Using the methods described in previous chapters, you may want to check your @%fkW"y:
model before you run a simulation. /KV@Ce\
Click on various parts of the model in the 3D Design View. Or use the System GYs4#40
Navigator to select different surfaces and view their Properties. kU^@R<Fo
1.In the System Navigator, click to open BottomSurface of the LightGuide, then R1m18 G HQ
click Zones, and then click Texture. ~ ZDdzp>
2.Select SphericalElement, and then right-click and select Properties from the >qgBu_
shortcut menu. The Shape tab shows you a graphical representation of the :-
5Mn3*
spherical bump shape that is the bottom of the light guide. Wex4>J<`/
You might be curious as to why you cannot see the 3D texture property zones you x
p$0J<2
defined. They are invisible by default, because drawing thousands of texture "yz@LV1
elements can make displaying and exploring the model somewhat slow. If you r-0
7! A
choose to make them visible, 3D textures are displayed in wireframe, even if the 4{Ak|
display mode is set to translucent. Wireframe rendering displays a bit faster and %FRkvqV*
shows more of the technical details. AP~!YwL W
92 * LightTools Introductory Tutorial Pb` sn 5;
"bO]
HAPTER 5 Introduction to Backlight Design #nxx\,i>
C 2>r .[
1.Rotate and zoom the model to that you can see something like the illustration (#,.;Y
below: aOuon0
. ZEMo`O
2.To reveal the Property Zones: j>:T)zhyY
a.Right-click in the Design View and select View Preferences to display this 97 g-*K
dialog box. @kK=|(OB'
b.On the Visibility tab, click the Property Zone check box to turn it on. BA5= D>T-
c.Click OK. KWY G\#S0]
You will see the wire frame rendering of the spherical bumps on the ";xEuX
bottom surface, and a solid color above it. The solid color is the 3D texture +Q9HsfX/
of the BEFs (brightness-enhancing films) built automatically by the utility.
