The default number of bumps is 100 (10 X 10). You need to change these N<VJ(20y
parameters to match your design. Note that LightTools allows many other S|N_ o
placement options, but you will use the Bezier placement option for this X5$ Iyis
example. ;dgp+
5.On both the X Placement tab and Y Placement tab, change the Number of z46~@y%k
Bumps parameter to 300, as shown in the following figure. Click Apply after
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each change. nmKp[-5
6.Click OK to close the dialog box. e6$W Qd`O
Note that the number of bumps is 300 X 300, which results in about 90,000 HQhM'x
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ;[OH(!
manner defined by the Bezier parameterization option. Please see Chapter 5 of ?%[@Qb=2
the LightTools Core Module User’s Guide for more information. With the ]GkfEh7/J
current parameter values, the Bezier option varies the bump spacing along the Q/0Tj]D
length of the light guide. The spacing in the orthogonal direction is constant. Eo]xNn/g
The X and Y refer to the local coordinate system of the surface. JL{VD
/f
LightTools Introductory Tutorial * 91 :*9Wh
y766;
X:J
HAPTER 5 Introduction to Backlight Design ]Q)OL
C =dYqS[kJW
Examining Surface Properties c,+: i1IAy
Using the methods described in previous chapters, you may want to check your JP [K;/
model before you run a simulation. s9DYi~/,
Click on various parts of the model in the 3D Design View. Or use the System aj{Y\
3L
Navigator to select different surfaces and view their Properties. JU&c.p
/
1.In the System Navigator, click to open BottomSurface of the LightGuide, then HY:o+ciH'
click Zones, and then click Texture. g (CI;f}y
2.Select SphericalElement, and then right-click and select Properties from the ; )@~
shortcut menu. The Shape tab shows you a graphical representation of the M!D3 }JRm
spherical bump shape that is the bottom of the light guide. [/ 41 % B2
You might be curious as to why you cannot see the 3D texture property zones you 56 kI
5:
defined. They are invisible by default, because drawing thousands of texture R(G7m@@{
elements can make displaying and exploring the model somewhat slow. If you =W!/Z%^*8
choose to make them visible, 3D textures are displayed in wireframe, even if the $5%SNzzl
display mode is set to translucent. Wireframe rendering displays a bit faster and x7<K<k;s
shows more of the technical details. u <v7;dF|s
92 * LightTools Introductory Tutorial /!XVHkX[
m tcw#D
HAPTER 5 Introduction to Backlight Design Si;H0uP O
C 7n<::k\lb
1.Rotate and zoom the model to that you can see something like the illustration P8/0H(,
below: #BH*Z(
. |#R7wnE[k~
2.To reveal the Property Zones: >e5 qv(y]
a.Right-click in the Design View and select View Preferences to display this -;WGS o
dialog box. Y\g3h M
b.On the Visibility tab, click the Property Zone check box to turn it on. ee76L&:
c.Click OK. w@w(-F!%l
You will see the wire frame rendering of the spherical bumps on the 'c$+sp ?
bottom surface, and a solid color above it. The solid color is the 3D texture kVLS
of the BEFs (brightness-enhancing films) built automatically by the utility.
