The default number of bumps is 100 (10 X 10). You need to change these #V_GOy1-
parameters to match your design. Note that LightTools allows many other W j MRH+
placement options, but you will use the Bezier placement option for this e%6{M E
3
example. :nGM tF
5.On both the X Placement tab and Y Placement tab, change the Number of :jem~6i
Bumps parameter to 300, as shown in the following figure. Click Apply after LtKB v 4
each change. x8N|($1
6.Click OK to close the dialog box. %w"nDu2Gcv
Note that the number of bumps is 300 X 300, which results in about 90,000 >|udWd^$3
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a \cySWP[
manner defined by the Bezier parameterization option. Please see Chapter 5 of y { =NP
the LightTools Core Module User’s Guide for more information. With the /oP^'""@je
current parameter values, the Bezier option varies the bump spacing along the r6.N4eW.L
length of the light guide. The spacing in the orthogonal direction is constant. Kn}ub+
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The X and Y refer to the local coordinate system of the surface. ^^?q$1k6r*
LightTools Introductory Tutorial * 91 \ L] |-f(4
f} K`Jm_}?
HAPTER 5 Introduction to Backlight Design =,/D/v$m'2
C ^ gR+S
Examining Surface Properties tJD]
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Using the methods described in previous chapters, you may want to check your h'5Cp(G
model before you run a simulation. XB\zkf_}Xc
Click on various parts of the model in the 3D Design View. Or use the System 5vOC CW
Navigator to select different surfaces and view their Properties. <[Oo*:A!7
1.In the System Navigator, click to open BottomSurface of the LightGuide, then u?0d[mC
click Zones, and then click Texture. 80hme+e
2.Select SphericalElement, and then right-click and select Properties from the <@#PF$!
shortcut menu. The Shape tab shows you a graphical representation of the z'MS#6|}
spherical bump shape that is the bottom of the light guide. Oh!(@
You might be curious as to why you cannot see the 3D texture property zones you #@//7Bf%
defined. They are invisible by default, because drawing thousands of texture t&RruwN_;
elements can make displaying and exploring the model somewhat slow. If you $ |<m9CW
choose to make them visible, 3D textures are displayed in wireframe, even if the k
onoI&kV|
display mode is set to translucent. Wireframe rendering displays a bit faster and ]T<^{jG
shows more of the technical details. Qi=* 1QAkr
92 * LightTools Introductory Tutorial S*t%RZ~a
AFm1t2,+;
HAPTER 5 Introduction to Backlight Design shFc[A,r}
C q-AN[_@
1.Rotate and zoom the model to that you can see something like the illustration 7TWNB{
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below: <Oz66bTze
. L\ j:
2.To reveal the Property Zones: 3LK%1+)4
a.Right-click in the Design View and select View Preferences to display this = uV,bG5V1
dialog box. i/qTFQst
_
b.On the Visibility tab, click the Property Zone check box to turn it on. GjQfi'vCk
c.Click OK. v3^|"}\q5
You will see the wire frame rendering of the spherical bumps on the NPJ.+ph
bottom surface, and a solid color above it. The solid color is the 3D texture kBsXfVs9
of the BEFs (brightness-enhancing films) built automatically by the utility.
