The default number of bumps is 100 (10 X 10). You need to change these WS?Y8~+{5
parameters to match your design. Note that LightTools allows many other 4Ss y (gt
placement options, but you will use the Bezier placement option for this 9 '(m"c_
example. l<<9H-O
5.On both the X Placement tab and Y Placement tab, change the Number of t<$J
3h/"
Bumps parameter to 300, as shown in the following figure. Click Apply after >6@,L+-6r
each change. dTlEEgR
6.Click OK to close the dialog box. Kb-m
Note that the number of bumps is 300 X 300, which results in about 90,000 _ 34%St!lg
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a GU 9p'E
manner defined by the Bezier parameterization option. Please see Chapter 5 of Pj_DI)^
the LightTools Core Module User’s Guide for more information. With the oIMS >&
current parameter values, the Bezier option varies the bump spacing along the -w8?Ur1x:
length of the light guide. The spacing in the orthogonal direction is constant. h(3-/4
The X and Y refer to the local coordinate system of the surface. Y=O-^fL
LightTools Introductory Tutorial * 91 }jU)s{>f b
h|i b*%P_
HAPTER 5 Introduction to Backlight Design 9C7HL;MF
C Dkh=(+> <
Examining Surface Properties F pwhy ls
Using the methods described in previous chapters, you may want to check your N e z '1
model before you run a simulation. :_nGh]%
Click on various parts of the model in the 3D Design View. Or use the System %K06owV(S)
Navigator to select different surfaces and view their Properties. qV,x )y:V
1.In the System Navigator, click to open BottomSurface of the LightGuide, then B(6*U~Kn%
click Zones, and then click Texture. ]1|7V|N6
2.Select SphericalElement, and then right-click and select Properties from the l8_RA
shortcut menu. The Shape tab shows you a graphical representation of the _\=
/~>Xl
spherical bump shape that is the bottom of the light guide. II[-6\d!
You might be curious as to why you cannot see the 3D texture property zones you 5Z"N2D)."
defined. They are invisible by default, because drawing thousands of texture hst Ge>f[6
elements can make displaying and exploring the model somewhat slow. If you ~ahu{A 4Bw
choose to make them visible, 3D textures are displayed in wireframe, even if the '" ze Im~
display mode is set to translucent. Wireframe rendering displays a bit faster and N pQOLX/<?
shows more of the technical details. Z@$'fX?~9
92 * LightTools Introductory Tutorial e 0Z2B2
]"YXa~b
HAPTER 5 Introduction to Backlight Design x") Bmw$
C %|f@WxNrU
1.Rotate and zoom the model to that you can see something like the illustration $BB^xJ\O
below: cS@p`A7Tpo
. [9Tnp ]q
2.To reveal the Property Zones: 9 }42s +
a.Right-click in the Design View and select View Preferences to display this JS<w43/j
dialog box. &_j<! 3*
b.On the Visibility tab, click the Property Zone check box to turn it on. A1z<2.R
c.Click OK. QA)"3g
You will see the wire frame rendering of the spherical bumps on the BJLe E}= H
bottom surface, and a solid color above it. The solid color is the 3D texture 8,VEuBZ
of the BEFs (brightness-enhancing films) built automatically by the utility.
