The default number of bumps is 100 (10 X 10). You need to change these QE`:jxyad
parameters to match your design. Note that LightTools allows many other )Gu0i7iN
placement options, but you will use the Bezier placement option for this Rh05W_?Js
example. %Q>~7P
5.On both the X Placement tab and Y Placement tab, change the Number of "^e}C@
Bumps parameter to 300, as shown in the following figure. Click Apply after oho AUT
each change.
Q 37V!
6.Click OK to close the dialog box. tk] _QX
%
Note that the number of bumps is 300 X 300, which results in about 90,000 BXKlO (7
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a <s59OdzP
manner defined by the Bezier parameterization option. Please see Chapter 5 of lN*1zM<6;
the LightTools Core Module User’s Guide for more information. With the pGZl.OI
current parameter values, the Bezier option varies the bump spacing along the A>ug'.
length of the light guide. The spacing in the orthogonal direction is constant. )U"D4j*p
The X and Y refer to the local coordinate system of the surface. !=k* hl0h
LightTools Introductory Tutorial * 91 5Xq.=/ eX
71}L# nQ
HAPTER 5 Introduction to Backlight Design \ _-kOS
C [TpA26#TTO
Examining Surface Properties tq4"Q BIKh
Using the methods described in previous chapters, you may want to check your TA-(_jm
model before you run a simulation. 945
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Click on various parts of the model in the 3D Design View. Or use the System r7wx?{~ 28
Navigator to select different surfaces and view their Properties. Sl+jduc
1.In the System Navigator, click to open BottomSurface of the LightGuide, then %Hl:nT2M
click Zones, and then click Texture. D!OG307P
2.Select SphericalElement, and then right-click and select Properties from the Aspj*CDu
shortcut menu. The Shape tab shows you a graphical representation of the &zg$H,@Qp
spherical bump shape that is the bottom of the light guide. gpO_0U4lQ]
You might be curious as to why you cannot see the 3D texture property zones you 0qotC6l~_w
defined. They are invisible by default, because drawing thousands of texture A{u\8-u
elements can make displaying and exploring the model somewhat slow. If you yC&b-y
choose to make them visible, 3D textures are displayed in wireframe, even if the Fh3Dc 83~
display mode is set to translucent. Wireframe rendering displays a bit faster and C7c|\ T
shows more of the technical details. \V!X& a
92 * LightTools Introductory Tutorial E-7a `S
jmZ|b6
HAPTER 5 Introduction to Backlight Design {TcbCjy w
C >8Yrmq
1.Rotate and zoom the model to that you can see something like the illustration D ^T7pO
below: v2W"+QS}u
. ys"mP* wD
2.To reveal the Property Zones: sQ3ayB`
a.Right-click in the Design View and select View Preferences to display this ,~=z_G`R
dialog box. l5N\> q
b.On the Visibility tab, click the Property Zone check box to turn it on. ck4T#g;=
c.Click OK. Sv^'CpQ
You will see the wire frame rendering of the spherical bumps on the fSQ3 :o
bottom surface, and a solid color above it. The solid color is the 3D texture $M8> SLd
of the BEFs (brightness-enhancing films) built automatically by the utility.
