The default number of bumps is 100 (10 X 10). You need to change these 25|8n feC5
parameters to match your design. Note that LightTools allows many other 'QH1=$Su
placement options, but you will use the Bezier placement option for this $7Mtt.d 6
example. 6V+ qnUk
5.On both the X Placement tab and Y Placement tab, change the Number of O 0*e)i8
Bumps parameter to 300, as shown in the following figure. Click Apply after TfZ6F8|B
each change.
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6.Click OK to close the dialog box. W~B5>;y
Note that the number of bumps is 300 X 300, which results in about 90,000 Lj %{y.Rj
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a m:O(+Fl
manner defined by the Bezier parameterization option. Please see Chapter 5 of sK=}E=
the LightTools Core Module User’s Guide for more information. With the X0+fsf<H}
current parameter values, the Bezier option varies the bump spacing along the RQvV R
length of the light guide. The spacing in the orthogonal direction is constant. \hP=-J [~C
The X and Y refer to the local coordinate system of the surface. 8?Y['
LightTools Introductory Tutorial * 91 ,Ci/xnI
m >e3vu
HAPTER 5 Introduction to Backlight Design h? yG<>wI
C baoD(0d
Examining Surface Properties rp :wQ H7
Using the methods described in previous chapters, you may want to check your `
e {BId
model before you run a simulation. qJT0Y/l:(
Click on various parts of the model in the 3D Design View. Or use the System ] yX@'f
Navigator to select different surfaces and view their Properties. 4*UP. r@
1.In the System Navigator, click to open BottomSurface of the LightGuide, then *Wb=WM-.
click Zones, and then click Texture. -#A:`/22
2.Select SphericalElement, and then right-click and select Properties from the ;<G<1+
shortcut menu. The Shape tab shows you a graphical representation of the IdRdW{o
spherical bump shape that is the bottom of the light guide. K,}w]b
You might be curious as to why you cannot see the 3D texture property zones you 9;r? nZT/
defined. They are invisible by default, because drawing thousands of texture g "!\\:M
elements can make displaying and exploring the model somewhat slow. If you 8<)$z?K
choose to make them visible, 3D textures are displayed in wireframe, even if the r7!J&8;{K
display mode is set to translucent. Wireframe rendering displays a bit faster and ^2M!*p&h
shows more of the technical details. _8h8Wtif
92 * LightTools Introductory Tutorial Gwd{#7FM`
af+}S9To
HAPTER 5 Introduction to Backlight Design .1*DR]^`
C m<3v)R[>
1.Rotate and zoom the model to that you can see something like the illustration GZ0aOpUWVq
below: *"G 8
. VKLU0*2R
2.To reveal the Property Zones: ]s|lxqP
a.Right-click in the Design View and select View Preferences to display this CYB=Uq,
dialog box. `:-J+<`
b.On the Visibility tab, click the Property Zone check box to turn it on. H] qq ~bO[
c.Click OK. nY) .|\|i
You will see the wire frame rendering of the spherical bumps on the Gbd?%{Xc-
bottom surface, and a solid color above it. The solid color is the 3D texture <qiICb)~
of the BEFs (brightness-enhancing films) built automatically by the utility.
