The default number of bumps is 100 (10 X 10). You need to change these :#D?b.=
parameters to match your design. Note that LightTools allows many other 3jF#f'*
placement options, but you will use the Bezier placement option for this RtVy^~=G
example. iEx.BQ+
5.On both the X Placement tab and Y Placement tab, change the Number of r~cmrLQa
Bumps parameter to 300, as shown in the following figure. Click Apply after P^m+SAAB
each change. u8ofgcFYE
6.Click OK to close the dialog box. Y `4AML
Note that the number of bumps is 300 X 300, which results in about 90,000 b3(pRg[Fp
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a tHNvb\MR$
manner defined by the Bezier parameterization option. Please see Chapter 5 of w-2&6o<n-
the LightTools Core Module User’s Guide for more information. With the mF!/8qk
current parameter values, the Bezier option varies the bump spacing along the ) aoB -Lu
length of the light guide. The spacing in the orthogonal direction is constant. D|-^}I4
The X and Y refer to the local coordinate system of the surface. f[ ,9WkC
LightTools Introductory Tutorial * 91 ?^Sk1 7G
C${{&$&
HAPTER 5 Introduction to Backlight Design (vte8uQe
C u@ |izRk
Examining Surface Properties D'V0b"
Using the methods described in previous chapters, you may want to check your 9pPb]v,6
model before you run a simulation. 0kN;SSX!
Click on various parts of the model in the 3D Design View. Or use the System .C^ 1.)
Navigator to select different surfaces and view their Properties. 6OYXcPW'
1.In the System Navigator, click to open BottomSurface of the LightGuide, then H /Idc,*
click Zones, and then click Texture. Ol ,;BZHc\
2.Select SphericalElement, and then right-click and select Properties from the V:F;Nq%+j
shortcut menu. The Shape tab shows you a graphical representation of the |1^>n,C
spherical bump shape that is the bottom of the light guide. ^l1tQnj)7
You might be curious as to why you cannot see the 3D texture property zones you ;\`~M
defined. They are invisible by default, because drawing thousands of texture bc}X.IC
elements can make displaying and exploring the model somewhat slow. If you :xw2\:5~0
choose to make them visible, 3D textures are displayed in wireframe, even if the =4GJYhj
display mode is set to translucent. Wireframe rendering displays a bit faster and RZ)sCR
shows more of the technical details. 4R!A.N 9
92 * LightTools Introductory Tutorial H5t 9Mg|
8@%Xd^
HAPTER 5 Introduction to Backlight Design $ tf;\R
C 4 -)'a} O
1.Rotate and zoom the model to that you can see something like the illustration Q(SVJ
below: c> fLSf
. EubR] ckB
2.To reveal the Property Zones: ?f v?6 r
a.Right-click in the Design View and select View Preferences to display this `x:znp} '
dialog box. gyH'92ck
b.On the Visibility tab, click the Property Zone check box to turn it on. kN uDoo]z
c.Click OK. 1|Y(XB^os(
You will see the wire frame rendering of the spherical bumps on the fr'M)ox1
bottom surface, and a solid color above it. The solid color is the 3D texture I( BG%CO9
of the BEFs (brightness-enhancing films) built automatically by the utility.
