| chm85 |
2007-11-13 13:40 |
The default number of bumps is 100 (10 X 10). You need to change these X ,ok 3c4X
parameters to match your design. Note that LightTools allows many other cBDOA<]r,
placement options, but you will use the Bezier placement option for this _2rxDd1#.
example. e*hCf5=-
5.On both the X Placement tab and Y Placement tab, change the Number of 1SY3
Bumps parameter to 300, as shown in the following figure. Click Apply after &C.m*^`^
each change. aT}?-CUxx
6.Click OK to close the dialog box. k*o>ZpjNH
Note that the number of bumps is 300 X 300, which results in about 90,000 %lqrq<Xn
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Ct pc]lJ}
manner defined by the Bezier parameterization option. Please see Chapter 5 of )d7U3i
the LightTools Core Module User’s Guide for more information. With the HVaKy+RU
current parameter values, the Bezier option varies the bump spacing along the ^_XV }&7Q
length of the light guide. The spacing in the orthogonal direction is constant. oPC
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The X and Y refer to the local coordinate system of the surface. S\W&{ +3
LightTools Introductory Tutorial * 91 4 KZ )`KPE
MB3
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HAPTER 5 Introduction to Backlight Design 5gH'CzU?
C (qg~l@rf
Examining Surface Properties nCPIpw,]M
Using the methods described in previous chapters, you may want to check your /*hS0xN*
model before you run a simulation. zJT ,Hv .
Click on various parts of the model in the 3D Design View. Or use the System k{ibD5 B
Navigator to select different surfaces and view their Properties. sT+\
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1.In the System Navigator, click to open BottomSurface of the LightGuide, then ^5 ~)m6=2
click Zones, and then click Texture. 15wwu} X
2.Select SphericalElement, and then right-click and select Properties from the VQHQvFRZ)
shortcut menu. The Shape tab shows you a graphical representation of the ?PDrj/: *
spherical bump shape that is the bottom of the light guide. m_,j)A%
You might be curious as to why you cannot see the 3D texture property zones you p^i]{"sjbU
defined. They are invisible by default, because drawing thousands of texture O`FuXB(t
elements can make displaying and exploring the model somewhat slow. If you VIg=| Oe),
choose to make them visible, 3D textures are displayed in wireframe, even if the *&vi3#ur
display mode is set to translucent. Wireframe rendering displays a bit faster and h sHtLH+@
shows more of the technical details. ,7*-%05[\
92 * LightTools Introductory Tutorial b@yFqgJ_
z+F:_
HAPTER 5 Introduction to Backlight Design VO+3@d:
C KSy.
1.Rotate and zoom the model to that you can see something like the illustration iYl$25k/1
below: eVB.g@%T
. 4{J'p19
2.To reveal the Property Zones: ?%RR+(2m
a.Right-click in the Design View and select View Preferences to display this v m)'C C
dialog box. 77o&$l,A|
b.On the Visibility tab, click the Property Zone check box to turn it on. eKek~U&
c.Click OK. $,#,yl ol
You will see the wire frame rendering of the spherical bumps on the J&jig?t
bottom surface, and a solid color above it. The solid color is the 3D texture O!.mc=Gx7
of the BEFs (brightness-enhancing films) built automatically by the utility.
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